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The former Mickey Mouse Club co-stars are still BFFs! Or at the very least, making sure to be polite to each other on Twitter.

Pop princess Britney Spears has been busy promoting her latest album Femme Fatale - which drops today! - on Good Morning America, and so fellow singer Christina Aguilera felt the need to Tweet Brit and congratulate her...

The "Genie in a Bottle" singer wrote: "Congrats on Femme Fatale release! Can't wait to see what you bring in the next video. xo - Xtina."

And Britney even responded back, "Thanks. Can't wait to watch you on your new show. Hope we get to hear that voice on The Voice. -Brit."

The two starlets famous united on stage at the MTV Video Music Awards in 2003 and made out with Madonna. Check out the kiss below the cut!