Popcorn Moments: Britney Spears, Madonna, & Christina Aguilera's 2003 MTV VMA Performance

Who could forget the infamous MTV Awards kiss?

In 2003 Britney Spears and Christina Aguilera took to the stage to pay tribute to Madonna. The two biggest pop sensations at the time wore a wedding dress that resembled the wedding dress worn by Madonna when she performed her song "Like A Virgin" at the very first MTV Video Music Awards in 1984.

Madonna would later join Britney and Christina on stage to perform her song "Hollywood" and would later seal the performance with a kiss. No one really remembers what happened after the kiss, some people didn't even acknowledge Christina getting sloppy seconds and we completely forgot that Missy Elliot had a part in it all, but the performance was a certified popcorn moment.

And please pause the video at 3:09 to get Justin Timberlake's side-eye. Notice after the kiss him mean mugging..too priceless.

Was he disappointed in his ex or was he just a little sour about not being asked to join?

Ke$ha Slams Britney Spears' Lip-Synching: 'If You're Going To Be A Singer, You Should Sing'

There may have been shots fired here....

For those of you who are not familiar with Ke$ha she is the voice behind the hit pop single "Tik Tok." Because the song has been doing pretty well, she has gotten a little momentum and a boat load of media attention.

Clearly all of the attention due to her eccentric personality and persona encouraged her to sip on a glass full of truth juice, because she decided to get real about Britney Spears's lip-synching.

Britney, who has been lip-synching since the start of her career surprisingly unbeknown to many, has been under fire following a concert she performed in when her tour touched down in Australia.

Now, Ke$ha has something to say about it too, stating in a recent interview that if Britney Spears is supposed to be a singer she should sing and not mime.