Britney Spears' wedding ... joining forces for 2003's "Me Against the Music" duet. Later that year, the pair shared an infamous kiss during a performance with Christina Aguilera and Missy Elliott ...

The pair — who famously locked lips during a performance at the 2003 event, alongside Christina Aguilera — shared a smooch again on Thursday at Spears ... Menounos, Paris Hilton, her husband ...

The use of autotune on a Spears track, some critics argued, positioned the singer as being less gifted and less authentic than Aguilera. In this equation, Christina was better; Britney ...

Paris Hilton knows how to get a party jumping ... including video of her and a friend dancing on a table to her best friend, Britney Spears' song, "Work Bitch." Snoop Dog led everyone in singing ...