Tiffani Thiessen and husband Brady Smith have a reason to celebrate!

The couple welcomed their first child, daughter Harper Renn Smith, on Tuesday in Los Angeles, her rep tells our friends over at PEOPLE exclusively.

Baby Harper, who weighed in at 8 lbs., 3 oz., is "doing great," as are the new parents.

Thiessen's colleagues say motherhood is something the actress is more than prepared for. "She's totally the den mother of the show," White Collar costar Matt Bomer told PEOPLE in February. "She's so organized and so loving and generous – that can only make her an absolutely amazing mom."