Worlds collided this morning on the set of “Good Morning America”:

Nicely done, RiRi. Viewers thought Stamos rather enjoyed it, too:

But really, who cares about Rihanna? We want to be the objects of his affection. Especially after this:

For the record, he was rocking Dannon Oikos underwear.

Ha-cha-cha!

Call us, John.

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Update:

Everywhere you look! Tasty John Stamos takes his Oikos striptease to ‘The View’ [pics]

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Related:

Twitchy coverage of Rihanna

Twitchy coverage of John Stamos