VIDEO: Sneak Peek - Tonight's Episode of CBS's HOW I MET YOUR MOTHER

On tonight's episode of the CBS comedy HOW I MET YOUR MOTHER entitled '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. The episode airs tonight, 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. Get a sneak peek below!

HOW I MET YOUR MOTHER is a comedy about Ted and how he fell in love. It all started when Ted's best friend, aspiring environmental lawyer Marshall, proposed to his college sweetheart, Lily, a kindergarten teacher. Now that the two have had a baby, Ted realizes that he had better get a move on it if he too hopes to find true love.

Helping him in his quest to find his future wife is Barney, a friend with endless, sometimes outrageous opinions, a penchant for suits and a foolproof way to meet women. When Ted meets Robin, he's sure it's love at first sight, but after a whirlwind romance with her, he realizes destiny has something else in store for him. The series is narrated through flashbacks from the future.