Pink has accused Chris Brown of miming at the Billboard awards.
The singer was not impressed by the younger star's rendition of 'Turn up the Music 'at the show last night, as she didn't think he was performing live.
She tweeted: "One day if I lip-sync, I hope I do it as well as him."
Pink's husband, Carey Hart also appeared to level criticism at Katy Perry, comparing her to his wife as she performed 'Wide Awake'.
He tweeted: "I'm pretty sure I saw my wife did that same performance, but she was 3 months pregnant and actually sang the song (sic)."
Perry had earlier arrived at the awards with her 91-year-old grandmother as her date.
Justin Bieber was also at the awards, where he said he was excited about the fact he, his mentor, and his protégé, 'Call Me Maybe' singer Carly Rae Jepsen were all there to celebrate.
He told MTV: "It's not a competition. It's all love. We're all a family. Carly is my artist, and I'm Usher's artist, so it's kind of cool that we're all performing here, together."
Winners at the award show included Adele, who picked up 12 awards, including the coveted Top Artist prize, and dance act LMFAO, who went home with six gongs.