Lindsay Lohan let rip on Twilight star Kristen Stewart during a presenting stint on US chat show Chelsea Lately.
Fresh out of rehab, Lindsay is doing the rounds trying to prove to the public that she can turn her life around this time.
A close source exclusively told E! News: "She is taking this really serious. She wants people to know the days of her clubbing and partying are over and she is a new girl."
Nonetheless, this didn't stop Lindsay getting the claws out on the late night programme, which thrives off bitchy comments.
Regular host Chelsea Handler doesn't pull any punches and it seems Lindsay decided to follow suit.
So, in keeping with the tone of the show, the young star took a swipe at Kristen Stewart and her consistent lack of smiles.
In particular, Lindsay referred to the recent incident when KStew, 23, was caught on camera telling a pap he was "a piece of sh*t" who didn't "deserve to breathe the same air" as her.
LiLo joked: "I'm just excited that Kristen Stewart, you know, finally showed some emotion."
The comment was met with chuckles from the panel and the crowd, but Linds did back-track a little.
She added: "No, I really do love her. She's awesome. I'm a Kristen Stewart fan."
Her softer side didn't last long as she went on to refer to Kristen's cheating scandal of 2012.
She said: "I will say this, of course she hates photographers - they got a picture of her kissing a married man in a Mini Cooper."
The 27-year-old also took a tongue-in-cheek approach to her own love life.
The Mean Girls star joked about the rumours of Harry Styles' bisexual relationship with Nick Grimshaw - which Hazza denied recently in GQ.
She laughed at herself and said: "I've been there."
She went on: "When asked how many people he slept with Harry said 'Yes, lower than 50...you’re cornering me...I’ve only ever had sex with two people'."
Referencing her own fling with Max George, she added: "Yeah, he’s never hung out with The Wanted and he’s obviously not counting oral."