Prior to her public drunkenness arrest, Christina Aguilera was already getting dirrty by hooking up with her boyfriend during a family party. Not exactly the sexiest of locales.

As reports the new issue of US Weekly:

An insider tells the new issue of Us Weekly (on stands now) that the Burlesque star and the production assistant even had sex in a bathroom at a recent family gathering.

“Her friends are fed up,” the source says of Aguilera’s recent antics, which included a New Year’s Eve blowout fight with her mom and a booze-filled night of crying at L.A. club The Dime in January. “Nobody can get through to her. They think she’s trashy. And her ego is out of control.”

“She’s really spiraling,” says the source. “I would be shocked if she’s not in rehab in the next month or two.”

Do you think Xtina is headed for rehab?