Caught in the act: Christina Aguilera and her new boyfriend were caught getting down & dirty in a bathroom at a recent family party!! That’s embarrassing… and apparently, Xtina is on the same down-spiraling road many of her fellow pop stars have been on…Read more after the jump!

@ItsLukieBaby

US Weekly reports on the incident:

An insider tells the new issue of US Weekly 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.”

And at least one Aguilera pal isn’t confident things will improve any time soon.

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