Jake Gyllenhaal enjoys lunch with a mystery brunette

Hollywood hunk Jake Gyllenhaal was spotted out in LA enjoying lunch with a mystery brunette.

The Brokeback Mountain star was seen with the attractive lady at trendy Joan's On Third Café in West Hollywood.

Gyllenhaal looked relaxed, in a cardigan and a pair of jeans, as he joked and laughed with the unknown woman. He was spotted ordering food, and drinking water.

Gyllenhaal, 27, is currently dating Oscar-winning beauty Reese Witherspoon, 31.

The pair first denied they were an item - but went public with their relationship after being spotted enjoying a romantic weekend in Rome in October.

Gyllenhaal and Witherspoon met during the filming of CIA thriller Rendition.

Witherspoon endured a public divorce with actor Ryan Phillipe in 2006.

Gyllenhaal also had a public split with Spiderman star Kirsten Dunst.

Gyllenhaal is currently busy filming new movie 'Brothers,' co-starring Tobey Maguire and Natalie Portman.