Kristen Stewart may be unable to leave the house for the most part, but Robert Pattinson is out and about.

The Twilight twosome parted ways last week, and Rob was spotted out partying in Hollywood on May 20, according to People.

Rob arrived at the club with friends just after 1 a.m., and he was "all smiles," according to an onlooker.

"He sat on the couch at his table and sipped on multiple vodka cocktails throughout the evening," the source says. 

Apparently, Rob was really enjoying the night out.

"You'd never know he had just gone through a breakup," says the insider. "He was smiling the entire night and was in a really good mood.  There wasn't a trace of sadness on his face."

In fact, Rob was spending quite a bit of time with a companion of the fairer sex.

"He spent most of the night chatting with a brunette," adds the source. "There was definitely some flirting going on but it was all just talking  there was nothing physical going on between them, and they never touched each other."  

This is a bit surprising, given that Kristen is said to be "sick to her stomach" about the split.

So is Rob just putting on a brave face, or has he truly moved on? Hmmm.

Source: People