FIRST PIC: Lauren Conrad Steps Out With New Boyfriend William Tell

Reality star Lauren Conrad and her new boyfriend William Tell leaving her condo and heading to lunch in Brentwood, California on May 19, 2012. Credit: FameFlynet

For Lauren Conrad, the William Tell Overture has just begun!

After about three months of dating, Conrad and new beau Tell were snapped out and about grabbing lunch together in the Brentwood nabe of Los Angeles on Saturday.

Us Weekly was first to break news that author, former Hills star and designer Conrad, 26, has been seeing University of Southern California law student Tell, 32; the duo first hit it off on Valentine's Day of this year.

Tell hails from Conrad's native Orange County, Calif., was an ex-guitarist for band Something Corporate and has romanced celebs before: He dated The Bachelor runner-up Sadie Murray in 2009 and 2010 and Hairspray actress Brittany Snow about three years ago.

"He's either deeply in love or he's on to the next thing," a source says of Tell. "He's the kind of guy you marry."

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Conrad split from actor Kyle Howard nearly a year ago, but is optimistic about Tell, according to a pal. "She hopes he's The One!"