Cara Delevingne and Michelle Rodriguez's relationship is said to be going "so fast".
The 21-year-old model and 35-year-old actress have been spotted out together a lot recently and are said to be smitten with each other.
Michelle has been open about her bisexuality in the past, while Cara previously posted on her Twitter: "Don't worry, I play for more than one team."
Those close to Cara are said to be worried about Michelle's influence on her as they both love partying.
"Cara's a very sweet girl but she's very impressionable. She's always had a wild streak too, that's why she and Rihanna get on so well. But we all know Cara's party side has landed her in scrapes before," an insider told British magazine Look.
"She arrived in London after being in Paris looking drawn and her friends are concerned all the partying is taking its toll. Everyone wants Cara to be happy, but the relationship is going so fast and there's a general feeling they're bad for each other."
Michelle has had a dramatic past, including being admitted to rehab for alcohol addiction and drink driving on a suspended license.
Cara's lavish lifestyle is thought to be getting out of hand. It is hoped her decisions in life won't reflect upon her career.
"Cara's 21, she loves to party and have fun, but she does it to such an extreme degree there's concerns she could end up ruining her career and acting dreams in one fell swoop," a source added. "She and Michelle are having the time of their lives, but it could all end in tears if they're not careful."
© Cover Media