Britney Spears BSPEARSSMILE0324_13.jpg Britney Spears' big guest appearance on How I Met Your Mother wasn't just a hit - it was the Mother of all hits!

The Hollywood Reporter reveals that the pop princess' episode of HIMYM reached record ratings last night, giving the show its highest rating ever!

The show also helped CBS win the evening's rating wars outright, despite hot competition from Dancing With The Stars and The Bachelor.

Congrats to Brit and everyone who works on HIMYM - looks like all your hard work paid off!