Khloe Kardashian has sparked rumors she is romancing R&B star Trey Songz, after the two were reportedly spotted locking lips in Las Vegas.

The Keeping Up With The Kardashians star was in Sin City on Saturday night (02Jul16), and was seen arriving with Trey to Drai's Nighclub at The Cromwell, where the singer is a resident artist.

According to Entertainment Tonight, Khloe sat in a VIP booth next to the stage, and watched the Say Aah singer entertain fellow clubgoers with some of his biggest hits.

An insider tells ET that later the two went to Drai's After Hours nightclub, where they were spotted making out early Sunday morning (03Jul16), and "weren't shy" about locking lips with people around them.

This is the second time in a week Khloe and Trey were spotted together - last Monday (27Jun16), Trey was one of the guests at her 32nd birthday bash in Hollywood.

The two were photographed leaving Dave and Buster's arcade together after her party, as she playfully touched him on their way out.

However, Khloe took to Twitter the next day (28Jun16) to slam tabloid rumors about her love life, without explicitly referring to the snaps of her and Trey.

"The most annoying thing about tabloid rumors is the double standard," she wrote in a since-deleted post. "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."

Khloe is in the middle of a divorce from estranged husband Lamar Odom. Since splitting from the former pro basketball player in 2013, she has dated rapper French Montana and basketball star James Harden.