The 32-year-old singer directly addressed the alleged infidelity for the first time during her gig on August 31 night, reported People magazine.
"So I know you know my boyfriend cheated on me," she told the crowd during her Piece of Me show in Las Vegas.
"But the best thing about being cheated on is I get to go on more first dates. I need a hot guy. Where are the hot guys here tonight," she added.
The mother of two has been in good spirits since becoming single.