Hollywood actor Sean Penn – who will play US gay advocate Harvey Milk in the hotly-anticipated biopic Milk to be released in November – reportedly texted his ex-wife Madonna to brag about his first gay kiss during filming.

Screen smootch: Sean Penn

His co-star James Franco reveals: "After our kiss, Sean texted Madonna and said, 'I just popped my cherry kissing a guy. I thought of you. I don't know why.'

"And then she wrote back and said, ‘Congratulations'."

Franco is interviewed about his role in Milk on the video clip below.