The news of the budding romance comes three months after Us Weekly exclusively revealed that the Friday Night Lights alum, 36, and Wilmer Valderrama called it quits following a brief rekindling of their 2012 relationship.
"They stopped dating," a source told Us of the former couple in September. The That '70s Show alum, 36, had just come out of a six-year relationship with singer Demi Lovato in June.
"He's a good friend to me," Kelly said of Valderrama during a September interview with Power 106's J Cruz and Krystal Bee. "Wilmer's a really, really good person. And any woman would be lucky to have him." She later played coy about their relationship status, saying, "It's funny — he's not my ex. We are good friends, and we always have been. We're not exes!"
Kelly previously dated former New York Yankees shortstop Derek Jeter and actor Chris Evans. Radnor, who currently stars on PBS' Mercy Street, has been linked to Marisa Tomei, Julia Jones and Lindsay Price.
Tell Us: Do you think Kelly and Radnor make a cute couple?