Is Keri Russell Dating Matthew Rhys? These Other Co-Stars Took Their Relationships Offscreen

The pair might play spies on the FX hit, but are they hiding a secret relationship in real-life as well?

Keri Russell and Matthew Rhys may be spies in the house of love! The actors, who play undercover KGB agents on the FX drama The Americans, are rumored to be involved in a real-life romance.

Russell, who has been separated from husband Shane Deary since the summer, was spotted doing some last-minute Christmas shopping with Rhys near her Brooklyn Heights home.

"They looked very much like a couple. They were laughing and walking closely together," a source told People.

Given their amazing chemistry on The Americans (which kicks off its second season in February), we're not entirely surprised! Russell is newly single, which could make this relationship complicated; she and Deary, a contractor, were married for six years and have two young children. But TV co-stars have often made great romantic partners. Here, five successful couples who fell in love between takes!

Mila Kunis & Ashton Kutcher -- It took them a while to come around, but six years after leaving The '70s Show, the former co-stars gave a real-life romance a try. Right now, rumors of an engagement are spreading like wildfire.

Anna Paquin & Stephen Moyer -- Given the complications of their human-vampire relationship on True Blood, Anna and Stephen probably had an easier time offscreen! The couple met on the HBO drama in 2008, married in 2010, and are now the parents of one-year-old twins Poppy and Charlie.

Alyson Hannigan & Alexis Denisof - The How I Met Your Mother star met the Grimm star when they worked together on Buffy the Vampire Slayer. They recently celebrated their ten-year wedding anniversary with a vow renewal in Hawaii, in front of their daughters Satyana, 4, and Keeva, 16 months.

Lauren Graham & Peter Krause - They're siblings onscreen, which may be why the Parenthood co-stars kept their relationship a secret for over a year! They came out as a couple in 2010.

Alexis Bledel & Vincent Kartheiser - Graham's former Gilmore Girls co-star also happened to fall in love on set. During a 2012 guest arc on Mad Men, she played the mistress of Vincent Kartheiser's character, Pete Campbell. Kartheiser popped the question in March 2013, and they're currently planning the wedding.

Donna Kaufman is a freelance writer and iVillage contributor. Find her on Twitter and Google+

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