AceShowbiz -

Khloe Kardashian was spotted making out with Trey Songz while they partied together at a nightclub in Las Vegas on Saturday, July 2. It happened just days after they got touchy freely at Khloe's birthday party.

Khloe and Trey arrived together at Drai's Nighclub at The Cromwell where the rapper was performing, an eyewitness told ET. She watched the R&B crooner from a VIP booth next to the stage, smiling the entire night as he was surrounded by scantily clad dancers during parts of his set.

The pair were seen making out in the early morning hours, after they moved on to Drai's After Hours nightclub. The eyewitness said, "They weren't shy about it!"

Khloe and Trey put on a very flirtatious display when leaving her birthday party on Monday night, June 27. They were all smiles while exiting Dave & Buster's in Hollywood together. At one point, she was seen caressing his back, playfully tickling him as she walked closely behind.

The next day, Khloe took to her personal website to blast rumors about her love life. "The most annoying thing about tabloid rumors is the double standard," she wrote, "If I'm 'spotted' hanging with a guy at a party - even if I'm just saying hi for a quick second - it immediately becomes a negative headline about how many guys I'm dating or how I'm getting back into a new relationship. Men don't get that reputation! They get a pat on the back. It irritates me." The posting has since been removed.