a white vintage Rolls Royce and 1920's style Justin and Selena Gomez

Despite dressing up in outfits that were years beyond their ages they managed to pull it off.

Teen lovers Justin Bieber and Selena Gomez were the surprise highlight of the red carpet at the 2011 American Music Awards on Sunday night.

The pair wowed the crowds as they arrived and departed the event in a white vintage Rolls Royce.

Dressed as if they had just walked off the set of Bugsy Malone, the sweethearts channeled Hollywood's most glamorous era as they hit the red carpet at the Nokia Theatre in Los Angeles..

Justin was a real dapper gent and wore a black tuxedo with a bow tie. The 17-year-old sported a new slicked back hairstyle to complete his 1920s look.

Pop princess Selena wore a metallic Giorgio Armani gown that was low cut and featured a thigh high slit. Her champagne satin dress was elegant but the backless feature added some spice to the outfit. With her hair in loose curls Gomez and Justin looked mature and classy in their vintage gear.

Selena, 19, and Justin couldn't keep their hands off each other and the pint sized Canadian was constantly seen kissing his beau. Justin also helped his girlfriend negotiate the red carpet as her gown was so long she kept stepping on it.

The long gown got special attention from singer Taylor Swift who took the time to give the gold Armani number a closer look. The recent paternity allegations didn't appear to have dampened the love between the two as they put on several public displays of affection.

Bieber took to the stage at the awards show and performed his Christmas hit Mistletoe. He was introduced by his best friend and collaborator Sean Kingston before lighting the stage with a smoke filled set.

Dressed in all white, the singer walked from side to side of the stage lighting a string of lights. Justin had tweeted earlier in the week about his excitement at performing Sunday night.

He said: 'AMA blocking rehearsal. @dankanter is here. sounds like fun.'

Dan Kanter, who is Justin's musical director, also tweeted: 'AMA rehearsal. JB is killing it! Just wait until you all see him tomorrow night!!!' As the crowd screamed, Bieber bounced on to stage and shuffled dressed in a pair of LMFAO's trademark Zubaz pants.

Wearing the yellow trousers and a sleeveless shirt with Sexy written on it the teen sensation did his dance and then ran off stage. At the end of the night Selena and Justin jumped back into their vintage Rolls Royce and a tired looking Gomez rested her head on Justin's shoulder.

The Baby Baby singer gave his girlfriend his tuxedo jacket to wear as she started to feel the cold and the pair were chauffeur driven back to their hotel.