Britney Spears and Criss Angel are heating up Las Vegas with their late-night antics.

As “Extra” reported yesterday, Britney and the illusionist were seen getting even closer in Sin City when they passed a lollipop back and forth as they partied in a club!

Now “Extra” can reveal that the sucker Britney was sharing is more than just a sweet treat: it’s a diet secret.

Insiders tell us she recently received a shipment of Hoodia lollipops, which suppress the appetite and supply an energy boost.