Credit: Anthony/PacificCoastNews Photo: Miley Cyrus Steps Out in Los Angeles on March 1, 2013

Fueling rumors that there may, indeed, be trouble in paradise, Miley Cyrus spent this past Saturday night (March 2) on the town while her fiancé, Liam Hemsworth, was nowhere in sight. We’re told that while Miley was one of the first people to arrive to the 20th birthday party of her good friend Victoria Justice, she showed up solo.

The bash was held at the ritzy RH Restaurant in the Andaz hotel. And while the birthday girl still isn’t old enough to drink, we’re told she was quite content to sip Vitaminwater. And when she wasn’t getting down on the dance floor, she was hamming it up while taking pictures in the TWISTER Rave photo booth.

In the meantime, Miley — whose relationship with Liam is reportedly on the rocks due to his possible indiscretions with other women — put on a brave face and hung with Victoria and her other famous pals including Chord Overstreet, Chris and Kyle Massey, and Colton Hayes.

“Liam was a no-show,” a source from the party confirms to Wetpaint Entertainment. “But Miley still managed to have fun. You could tell she was trying to focus on her friends and having a good time.”

That a girl, Miley!