Report: Josh Radnor and Julia Jones break up Josh Radnor arrives at the 2010 CBS Up Front at Lincoln Center in New York City on May 19, 2010.. LOS ANGELES, Feb. 1 (UPI) -- Hollywood couple Josh Radnor and Julia Jones have ended their yearlong romance, UsMagazine.com reported Friday. No reason was given for the split. Radnor is a cast member of TV's "How I Met Your Mother." Jones co-starred in the "Twilight" film franchise.