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Mayim Bialik, Johnny Galecki

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While these two may have blossomed into adults, Mayim Bialik and Johnny Galecki haven't forgotten about the the first time they locked lips. 

Nearly two decades before they co-starred on the hit CBS series, The Big Bang Theory, the former child stars were introduced on the set of Blossom, a 1990s sitcom and Bialik's claim to fame. 

Backed by some well done research, Conan O'Brien asked the two actors about their initial meeting during a group appearance on his late-night show Wednesday. 

"We were both 14. We kissed," Bialik recollected of his guest star appearance. Galecki added that it was the first stage kiss for both of the young actors, though Bialik remembered it as yet another adorable milestone. "It might have been my first real life kiss also." Awww!

Thankfully, O'Brien was well prepared with a throwback photo of the moment. Behold a teenage Galecki in a very vibrant shirt.

"Mayim, were you mad he got the nicer blouse?" Andy Richter quipped. 

 Their fellow actor Kunal Nayyar finally said what we were all thinking: "Do it again!"

While Bialik vehemently said no, the interview cut to the pair clutching each other's faces for a dramatic smooch. 

After all these years, the sparks still fly!