Miley Cyrus, Kellan Lutz Party Together After Britney Spears' Vegas Show With Katy Perry, Selena Gomez

Britney Spears' first Vegas show Friday night drew in several stars! Shortly after watching the pop diva take the stage, Miley Cyrus headed over to host a party at Beacher's Madhouse, where she spent time with Katy Perry and reunited with her latest Hollywood fling -- Kellan Lutz.

"Miley and Katy Perry settled into a booth with 10 or so others. Tons of fans crowded around the whole time," an insider tells Us Weekly of the shindig. "Katy was sitting next to Miley in the booth, with her back turned toward her, talking to some male friends." Some of those pals included Adam Lambert and Emile Hirsch, the eyewitness tells Us.

At one point, Cyrus was also spotted embracing 28-year-old Lutz while giving him a kiss on the cheek. Us exclusively confirmed on Dec. 26 that the two are currently hooking up. The Twilight alum, a friend of Liam Hemsworth's, is "nice eye candy" for Cyrus, a source told Us. "They really enjoy each other's company."

The "Wrecking Ball" singer wore a nude crop top for the bash, with a tight-fitting black stretchy one-piece suspender. She also rocked a shade of red lipstick, danced throughout the night and jammed to Lana Del Rey's "Summertime Sadness." Cyrus, 21, previously covered the hit song during an appearance on BBC Radio1's live lounge in November.

Earlier in the night, Cyrus was just getting the party started. While watching Spears perform hits such as "Work Bitch," "Drive Me Crazy" and "Stronger," she was seen hugging Perry in the crowd. The "Unconditionally" star was also seen sitting next to Selena Gomez during the show. Holly Madison and Spears' younger sister Jamie Lynn and her fiance Jamie Watson were also in attendance. By Nivel