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Undercover no more!

After months of quietly dating, Kelli Garner and Johnny Galecki flaunted their love March 18, kissing courtside at an L.A. Lakers game.

A source tells Us Weekly that, though it took some time for the pair to feel comfortable going public, the duo now feels the timing is right. "They're happy," the pal shares. "Of course they're not going to hide out. They have no reason to."

Prior to dating Garner, Galecki, 36--whose first big break was playing Darlene's boyfriend on Roseanne--dated his Big Bang Theory costar Kaley Cuoco for two years.

Though their relationship is still new, Galecki and the Pan-Am actress, 27, a self-described geek, seem to be quite the match. "I like men who are more in their heads," Garner has said. And a source close to the duo confirms it: "Johnny's really fallen for Kelli," the insider tells Us. "Right now, they're savoring their time together."