Stealing the show: Jennifer Lopez, left, dances as Marc Anthony performs at the American Idol finaleThe night belonged to Scotty McCreey, but even his vote-winning performance couldn't compete with the charms of Jennifer Lopez.
With her husband Marc Anthony performing, the American Idol judge took the role of backing dancer, shaking her body in a revealing white flounced mini dress.
As she twisted and turned around her grinning husband, Jennifer showed off her famous behind in a pair of fishnets.
Famous behind: Lopez shook her booty at the camera for a full 15 seconds while Anthony looked on in adorationShe then shook her booty at the camera for a full 15 seconds while Anthony looked on in adoration.
The couple, who have been married seven years, shared a passionate kiss on stage afterwards.
Anthony then whispered something into his wife's ear and she smiled broadly before putting her hand over his mouth to keep him quiet.
Dancing girl: The American Idol judge was playing backing dancer to her husbandJennifer, 40, was just one of many celebrities to take advantage of the millions watching to promote their latest offering.
Beyoncé joined the six female finalists for a high-octave performance of her new single Run The World (Girls).
Shaking her stuff: Jennifer Lopez arrives for the filming of American Idol on the red carpet
Standing out: It might not have been her night, but Jennifer was making the most of the red carpet momentThe grandest bid for attention came from Broadway's troubled Spider-Man: Turn Off the Dark, with composers Bono and The Edge performing with the musical's star, Reeve Carney.
Spider-Man was lowered down on a rope in front Lopez as she sat on the judge's panel.
Free advertising: The Edge and Bono performed as Spiderman descended; the U2 stars wrote the music for the troubled Broadway show
Hello there! Lopez peeled back Spiderman's mask and poked him on the nose in a parody of the famous kiss
Recreation: Lopez recreates the famous scene from Spiderman which sees Kirsten Dunst unmask her hero just enough for a kissIn a parody of the famous Spiderman kiss scene she peeled up his mask.
But with Anthony sat in the audience she stopped short of kissing the stunt-man, instead bopping him on the nose.
Lady Gaga, whose new album Born this Way is out this week, was another performer.
Rocking out: Judge Steven Tyler finally performed on the show, singing Aerosmith's Dream OnWearing studded hotpants, boots and bra the 25-year-old writhed with the dancer on a raised platform before kissing him on the lips and embracing.
The pair then held hands and jumped off the top of a large faux-cliff structure in a theatrical display of joint suicide.
Raunchy routine: Wearing studded hotpants, boots and bra, Lady Gaga writhed on a raised platform
Scared, Nigel? Gaga chases executive producer Lythgoe after her performanceOther performers with a product to push included Jack Black, star of Kung Fu Panda 2, who performed a duet with Casey Abrams.
Gladys Knight, who has a big Vegas show to promote, was also a performer.
Other high-wattage stars who took to the stage at the Nokia Theatre included Tony Bennett and Tom Jones.
We Run The world: Beyonce and the female finalists performed her new single
Special guest: Beyoncé has a single to promote, like many of her fellow celebrity performersEarlier the stars had joined the contestants on the red carpet.
In her gold jumpsuit, embellished with beads, Jennifer had evidently planned to stand out from the crowd.
Pia Toscano, Haley Reinhart and Naima Adedapo all arrived in white ahead of their joint performance, but showed their own sense of style in their clinging outfits.
Familiar faces: Jack Black and wife Tanya, Gordon Ramsay and Lil Jon all watched the grand finale
All the boys: James Durbin and Jacob Lusk have cheered up since they were last seen on screenPia was initially one of the favourites to win the show, and her premature departure led to threats by fans to boycott the series.
Other favourites were Jacob Lusk and rocker James Durbin.
Joining the contestants were a clutch of celebrities, including country music stars Carrie Underwood and Tim McGraw.
Marc Anthony & Jennifer Lopez (American Idol Season 10 Finale)
source: dailymail