Lindsay Lohan is cheating on her snowboarding, and equally addicted, new BF, Riley Giles-at least that’s the word from Star Magazine. The weekly snitchfest claims since sitting foot back in Tinelstown, LiHO has been sneaking out and trading saucy text messages with former flames Brody Jenner, Jude Law, Calum Best, and lesbian love Samantha Ronson.

“Riley doesn’t realize it yet, but he has his hands full with Lindsay.”

“….She knows their relationship has no real future. Lindsay loves the spotlight and wants to date another celebrity. And she’s already testing the waters, seeing who is interested.”

“Lindsay is cheating on Riley,” a friend claims. “It may not be physical cheating-yet-but she is deceiving him with all of her secret phone calls, texts, and e-mails. I bet it won’t be long before she’s actually hooking up with some of her exes behind Riley’s back.”

Lindsay is said to have recently teased Brody Jenner about getting together for some NSA sex, and she’s been calling Jude Law wanting to know when he’ll be back in Los Angeles and ready to hit the sack.

“It’s totally inappropriate and Riley would be crushed if he found out.”

“She knows she might get caught by Riley, which makes it all the more exciting for her.”

“Lindsay can’t help it. She loves sex and is addicted to drama,” another spywitness gushes to Star. “She has an obsessive personality and gets easily addicted to drugs, alcohol, cigarettes or men. She definitely needs sex.”

“Riley is new to the L.A scene, so he is incredibly trusting that Lindsay isn’t hooking up during any of these meetings-which might be a little naive. Unfortunately, he might have to find out the hard way that he’s not in Utah anymore.”