Ted is dating someone new, and Barney approves. Read the description of the upcoming How I Met Your Mother episode “Ring Up,” in which Pretty Little Liars actress Ashley Benson guest stars.

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CBS has issued the following press release for the episode:

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. 21 Ashley Benson (“Pretty Little Liars”) Guest Stars as Carly, Ted’s New Girlfriend CHEAT 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 Hendriks

DIRECTED BY: Pamela Fryman

The list of guest characters reveals that Pretty Little Liars actress Ashley Benson will be playing Carly – and we’re sure it’s not a coincidence that this is also! the name of Barney’s half sister.

We are not surprised that Barney would be encouraging Ted to date his sister, considering how much he likes Ted and probably wants him in the family. But Carly’s appearance at this point in the season (and the fact that she and Ted have nothing in common) sadly seems to put an end to the popular fan theory that Carly would indeed turn out to be the mother.

Still, we’re excited to see Benson appear on How I Met Your Mother!