What is britney spears 3?

"3" is a song by American singer Britney Spears from her second greatest hits compilation album, "The Singles Collection". The song was written and produced by Max Martin and Shellback, with additional writing from Tiffany Amber. It was released as a single in 2009 and peaked at number one on the Billboard Hot 100 chart, making it Spears' third song to top the chart after "…Baby One More Time" and "Womanizer". The song is an upbeat dance-pop track with lyrics about a threesome. The music video for "3" features Spears and two female dancers performing a choreographed routine in a white room, with footage of various couples engaging in sexual activities edited in between shots of the dancers. "3" was well-received by critics and fans, and helped cement Spears' place as a pop icon.