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BARNEY BEGS TED TO CONTINUE SEEING HIS YOUNGER, WILDER GIRLFRIEND, EVEN THOUGH TED HAS NOTHING IN COMMON WITH HER, ON “HOW I MET YOUR MOTHER,” MONDAY, JAN. 21Ashley Benson (“Pretty Little Liars”) Guest Stars as Carly, Ted’s New GirlfriendCHEAT TWEET: Barney begs Ted to continue dating a much younger girl @AshBenzo until he learns who she is! #HIMYM 1/21 @8PM ET/PT http://bit.ly/SmKGNn“Ring Up” — Barney begs Ted to continue seeing his much younger, much wilder girlfriend, even though Ted has nothing in common with her. Meanwhile, Robin must adjust to the power of the bling, on HOW I MET YOUR MOTHER, Monday, Jan. 21 (8:00-8:30 PM, ET/PT) on the CBS Television Network. Ashley Benson (“Pretty Little Liars”) guest stars as Carly, Ted’s new girlfriend.SERIES REGULARS:Josh Radnor (Ted)Jason Segel (Marshall)Cobie Smulders (Robin)Neil Patrick Harris (Barney)Alyson Hannigan (Lily)RECURRING CAST:Bob Saget (Narrator)GUEST CAST:Carly (Ashley Benson)Jason Watson (Barista)Chauncey Jenkins (Business Man)Sachin Bhatt (Man #1)Zach Bandler (Man #2)Jason Heymann (Man #3)Nikki Tuazon (Hot Girl)WRITTEN BY: Jennifer HendriksDIRECTED BY: Pamela Fryman