Sean Penn was so excited by his first on screen gay kiss, he text ex-wife Madonna to boast.

The actor locks lips with James Franco in new movie "Milk" and felt compelled to tell the pop superstar - who famously kissed Britney Spears and Christina Aguilera.

Sean Penn kissed his male 'Milk' co-star for what felt like "forever".

In the steamy scene, Sean is required to get passionate with his co-star Mark Martinez - who plays the famous cross-dressing disco singer Sylvester - and Mark says he "couldn't believe" how enthusiastic the Oscar-winner was.