Kristen’s plan to win Rob back reportedly involves getting in his pants — his underpants, that is. According to a new report, Kristen is wearing Rob’s old undies to help her cope with their trial separation.

Kristen Stewart didn’t entertain Patrick Schwarzenegger’s attempts at flirting on Feb. 9 at Taylor Lautner’s birthday party, and, according to a new report, it may be because she was wearing Robert Pattinson’s underwear! (That could’ve ended up being really embarrassing had the flirting progressed to something more.)

“Kristen is beside herself over Rob’s decision to step back from their relationship and has started wearing his old undies every days,” a friend tells Star magazine.

Kristen is infamous for wearing Rob’s clothes while they’re apart. In August, Kristen was regularly spotted wearing various items from Rob’s wardrobe, hoping he would forgive her after she cheated on him with Rupert Sanders.

Kristen Stewart Wears Robert Pattinson’s Clothes, Hoping He’ll Come Back To Her

Dr. Phil Dembo, a relationship expert, told HollywoodLife.com exclusively, “Kristen Stewart was seen wearing Rob Pattison’s hat and still wearing his ring [after her affair]. The hat and the ring [were] ways to keep him close and hope that one day he [would] see through his anger and his pain, and come back to her.” Clearly, it worked because Rob did come back to Kristen. They reunited and continued their relationship through the holidays.

Now, Rob, 26, and Kristen, 22, are on a trial separation while he films The Rover in Australia.

Dr. Ava Cadell, founder of Loveology University agrees, tells us, “Kristen Stewart [wears] Rob Pattinson’s [clothes] because she cannot imagine her life without him!”

Unfortunately, Rob is not a fan of Kristen wearing his underwear!

“He thought it was creepy. Kristen’s clinginess has been a problem, and this is just a step too far!” the source adds.

HollywoodLife.com reached out to Kristen’s rep. We have not received a comment yet.

What do YOU think, HollywoodLifers? Is Kristen wearing Rob’s underwear? And if so, is that cute or gross?

— Chris Rogers, Reporting by Sandra Clark & Eric Ray

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More Rob & Kristen Sharing Clothes News:

1. Robert Pattinson Wears Kristen Stewart’s Clothes?
2. Kristen Stewart: Why I Wear Robert Pattinson’s Clothes
3. Robert Pattinson To Kristen Stewart: Stop Wearing My Clothes — Report