Margaret Colin, who plays Blair Waldorf's mom, will appear in a March episode of the CBS crime drama as a love interest for Frank (Tom Selleck). Colin will play Melanie, a well-known investigative reporter for an international cable news network who has been carrying on a top-secret, long distance relationship with Frank for some time. However, their private and professional lives intersect in a dangerous way when Frank must track the bad guy who is after Melanie.
This isn't the first time Frank has been involved with someone from the media. He previously dated New York TV reporter Kelly Davidson (Andrea Roth).
The March episode will reunite Colin and Selleck, who previously co-starred in Three Men and a Baby and an episode of Magnum P.I.
Blue Bloods airs Fridays at 10/9c on CBS. Gossip Girl's 100th episode premieres Monday at 8/7c on the CW.