Credit: Noel Vasquez/Getty Images

Reese Witherspoon is sporting quite a rock!

On Tuesday night, the newly engaged actress, 34, flashed her engagement ring for the first time while attending the L.A. Lakers game with fiance Jim Toth. See more pics of Reese and Jim sitting courtside.

The CAA agent, 40, worked with jeweler William Goldberg to design the 4-carat, $250,000 Ashoka cut diamond ring before popping the question in December. ( was the first to announce the couple's "happy" engagement.)

Toth, who began dating the How Do You Know actress in January 2010 after she split from Jake Gyllenhaal, is already a hit with Witherspoon's kids, Ava, 11, and Deacon, 7.

"The kids are a big part of their relationship," a source recently told Us Weekly. "They're all comfortable together."