What were Ashton Kutcher and Mila Kunis whispering during Britney's sexy BBMAs opener?

Britney Spears opened today's Billboard music awards with an epic stage show, much to the amusement of the star-studded crowd.

Dominating the stage in a bedazzled red bikini and boots, with an army of backup dancers, the 34-year-old busted out a medley of hits like "Work B----," "Womanizer" and "Toxic", proving that Britney is back, b----, and here to slay.

But not everyone took the ambitious performance as seriously as the Millennium Award winner. From Wiz Khalifa popping his head up just in time to see her mount a giant guitar during "I Love Rock 'N' Roll", to Demi Lovato's uncontainable laughs, the audience reactions were just as entertaining as the show itself.

Brit was half way through the sultry ballad "Breathe On Me" when the camera turned to Ashton Kutcher, who whispered something that was apparently hilarious to his wife Mila Kunis.

It's moments like these that make us wish we could lip read. The cryptic whispering was not lost on viewers: