LOS ANGELES:

Oscar winning actress Reese Witherspoon is apparently having a clandestine affair with her co-star Jake Gyllenhall. “They are 100 per cent dating,” an inside source close to the couple said.

The two met last year while working in director Gavin Hood’s Rendition and caused a stir when they were spotted together in New York early this month. Since then, the couple’s friendship has blossomed into romance, reports www.hollywood.tv. “Gyllenhall and Witherspoon are being smart about things and keeping their relationship very discrete and out of the public eye,” added the source.