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Go-to TV "bad girl" Danneel Harris has been cast on comedy "How I Met Your Mother." EW.com reports that Danneel -- who you might recognize as Shannon McBain on "One Life to Live" or Rachel Gatina on "One Tree Hill" -- will play sister to Sarah Chalke's character Stella.

Rumors have been swirling that Stella is the mystery "mother" the show is working towards revealing. If so, we say watch out! Danneel's past characters have had a penchant for stealing men -- just ask Adriana and Brooke.

Who's the best bad girl on TV?