How I Met Your Mother

Spoiler Alert: Katy Perry is the mother of How I Met Your Mother — at least she seems to think so.

In a hilarious new set of promos for the pop princess' guest spot, airing Monday at 8/7c on CBS, Neil Patrick Harris scolds Perry for revealing the six-season long secret. In true Barney fashion, he also hits on her.

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In related news, if the How I Met Your Mother Facebook page hits 10 million followers, the cast says they promise to reveal the secret identity of a "very special lady."

Show of hands: Who thinks they'll actually reveal the mother on Facebook? Yeah, we didn't think so either.

Check out the promos and a special sneak peek below: