Lottie has been posting scantily-clad photos and joking about drugs after being admitted to rehab in Arizona to tackle her cocaine addiction.
Undeterred: Lottie Moss posted more sexy bikini selfies on Monday while in rehab for cocaine addiction - following claims sister Kate is 'mortified' by her behaviour
Undeterred by recent claims regarding her fractious relationship with Kate, Lottie posted a seductive snap clad in a velour bikini.
The tiny two-piece struggled to protect her modesty, with Lottie pulling on the strings to give a followers even more of a glimpse at her assets.
She captioned the racy snaps: 'Fck w me.'
Just four days before, Lottie posed topless while wearing nothing but a skimpy black thong as she sprawled out on a red velour sofa for a pair of X-rated snaps posted to Instagram.
Snap happy: The OnlyFans star, 24, took to Instagram on Monday to post a trio of selfies clad in a skimpy velour bikini - pictures that appear to have been taken from inside her rehab facility
The influencer left little to the imagination as she kicked her legs into the air and donned black boots before editing a pair of crosses over her modesty.
Sending temperatures soaring as she posed up a sultry storm, she was joined by a small white dog and tagged her location as Los Angeles, California.
In her caption, the 18+ model suggestively wrote: 'Come lay down with me.'
She revealed she's in rehab for substance abuse issues last week and is thought to be receiving treatment at a facility in Arizona - which suggest the racy shots taken on the west coast are throwbacks.
Racy: The tiny two-piece struggled to protect her modesty, with Lottie pulling on the strings to give a followers even more of a glimpse at her assets
Her superstar sibling has reportedly 'fallen in and out of sympathy' for her and has been left with her 'head in her hands' due to Lottie's questionable career choices.
Page Six claimed a family source told how even Kate's daughter Lila, 19, 'won't have anything to do with Lottie' due to her antics with the wrong crowd.
The insider said: 'During lockdown, Kate invited Lottie to come and live with her in the Cotswolds at her country house. Lila point-blank refused to have anything to do with Lottie on social media.'
The catwalk veteran, who was pictured alongside lines of a mysterious white powder in 2005, also allegedly finds it difficult to be around people who abuse cocaine and alcohol.
Happier times: Lottie's superstar sibling Kate, 48, (right) has reportedly 'fallen in and out of sympathy' for her and has been left with her 'head in her hands' due to her questionable life choices (pictured in 2019)
They added: 'Kate was frustrated because Lottie kept on wanting to drink and posting sexually provocative stuff on Insta all the time. It isn't easy for Kate to be around people who are drinking, and she definitely won't be around anyone who is using cocaine.
'Lottie had been in Los Angeles, running with a fast crowd, and Lila was not into it at all. She is disdainful of Lottie. Another time Lottie dyed her hair pink with Lila's help, and Lila refused to be in a single picture on Instagram with her.'
When Lottie finally departed the Vogue cover star's home 'in a foul mood', she left behind two bottles of her sister's favourite bottle of wine which was interpreted as a 'f**k you' gesture, according to the publication.
Kate and Lottie's representatives have been contacted for comment by MailOnline.
Racy: Just four days before, Lottie posed topless while wearing nothing but a skimpy black thong as she sprawled out on a red velour sofa for a pair of X-rated snaps posted to Instagram
Shocking: The OnlyFans star carried on with her antics as she went topless while wearing nothing but a skimpy black thong as she sprawled out on a red velour sofa for a pair of X-rated snaps posted to Instagram on Friday
Racy: In her caption, the 18+ model suggestively wrote: 'Come lay down with me'
Meanwhile, sources close to Lottie told The Daily Mail they expect Kate will keep her distance when her little sister emerges from the detox centre in Arizona she has retreated to.
Supposedly Kate, who has the same father as Lottie but not the same mother, will want to stay clean herself.
With her own 19-year-old model daughter Lila to care for, Kate's sobriety is vital, and she also fears the effects of association with a self-confessed addict.
That said, the source adds: 'Although they fell out when living together during the pandemic, when Kate took Lottie in, the pair continued to communicate and I believe that Kate was instrumental in getting Lottie into rehab a couple of weeks ago. Kate loves Lottie, of course, and will always try to help.'
'I have a really bad addiction to coke': Lottie recently admitted to a class A drug dependency after checking into a US rehab... before claiming she's been clean and sober for 18 days
Kate made numerous sacrifices over the past four years to try to stay clean of drugs and alcohol, including selling her £10 million house in Highgate, North London, to move 'out of reach of the temptations of the capital' and into the Cotswolds.
There, she claims to have fallen in love with the countryside, saying her garden is the 'most beautiful thing I have ever owned'. She has even learned how to make marmalade.
It's also a safe haven for Lila. That the teenager should stay on the straight and narrow and socialise with commercially useful friends such as designers Kim Jones and Marc Jacobs, is another priority.
'Would Lottie be a good influence on anyone?' asks a source. 'She is a lovely, fun person to be around but I don't think she's anyone's idea of a good role model.'
It comes after Lottie's father confirmed the model is doing 'just fine' in rehab while she seeks treatment for drug addiction.
After Lottie was accused by a follower of focusing more on her social media content than her recovery, Peter Moss told The Sun that his daughter is 'fine'.
Peter is also shares Kate with fist wife Linda Shepherd. Lottie's mother is model Inger, who is his second wife.
Earlier this month, the influencer revealed she's in rehab for substance abuse issues at an unspecified facility in the United States.
Lottie - whose career has taken a rather different trajectory to that of her sister - shared a series of TikTok videos as she explained she is receiving treatment for 'drug addiction'.
Referencing HBO's new series Euphoria - which focuses on a group of drug addicted high school students - Lottie added: 'I think I took euphoria too literally u guys.'
Mature: It has been claimed a family source told how even Kate's daughter Lila, 19, (left) 'won't have anything to do with Lottie' due to her antics with the wrong crowd (pictured in February 2022)
Lottie has remained active on social media and continues selling 18+ content on OnlyFans, despite attempting to change her lifestyle - a fact that has not gone unnoticed by followers.
In a second post, she wrote: 'The staff at r3h4b when I go outside for the 10000th time to $mok3.[sic]'
The video saw her miming to 'yes I will be having a motherf***ing cigarette today. If you're offended by a f***ing cigarette you might as well jump off a cliff now.'
After she shared the video, one follower commented: 'In rehab but more focused on making videos? Not putting in the work needed....' with Lottie replying: 'Everyone’s recovery is different - have a sense of humour.'
For help with substance abuse in the UK talk to FRANK on 0300 1236600
In the US call the National Council on Alcoholism and Drug Dependence, Inc. on 1 (800) NCA-CALL (622-2255)
Family: Lottie's father revealed she's is doing 'just fine' in rehab as she seeks treatment for drug addiction (Lottie pictured with parents Peter and Inga in 2014)