Britney Spears summons Nicole Richie onto stage

Pop star Britney Spears brought her good friend Nicole Richie on to the stage during her show in Las Vegas on Tuesday night (18Feb14).

Spears usually brings a male audience member out for a saucy segment in her Britney: Piece of Me shows, but on Tuesday night, she picked Lionel Richie's daughter.

While onstage, Richie had a leash tied around her neck and was led around the stage on all fours by Spears.

The Circus hitmaker later thanked Richie for her participation, writing in a post on Twitter.com, "Can we all give a round of applause to Nicole Richie for playing along in the show tonight? U (sic) looked hot crawling on all fours."