The pair has faced gossip suggesting they do not get along since signing up as judges on U.S. TV talent show "The Voice" earlier this year. They swiftly silenced the speculation by recording their hit duet "Moves Like Jagger," which they played at the awards ceremony.
However, rumors of a feud returned after Aguilera reportedly snubbed Levine's request for a hug and stormed off stage while they prepared for their performance on Sunday morning.
A source tells New York Post gossip column PageSix, "At the end of the number, Adam went to hug Christina in a friendly fashion, but she pushed him away, gave him a dirty look and stormed backstage."
But Levine's spokesperson has quickly rebuffed the report, insisting it is "100 per cent not true".