Did you know that “The Big Bang Theory” stars Mayim Bialik and Johnny Galecki were a couple some years back? She was part of a nineties show, “Blossom,” and Galecki was a guest star. This reel-life couple, then teenagers, even shared a kiss. They recreated the “Blossom” snog on the “Conan” show.

Had such a blast with @TeamCoco and the cast of @bigbangtheory_cbs last night!! Obsessed with this @lapetiterobemi dress. Thank you @lamb shoes, @lasoula_jewelry, and @katie_watford for pulling it all together!

A post shared by mayim bialik (@missmayim) on

They were along the entire cast of “The Big Bang Theory” on the “Conan” show to mark the 200th episode of show, reveals Us Weekly. During the course of the episode, the host, Conan O’Brien told the cast about the “history” that Bialik and Galecki shared. “Two of you have a history that goes back quite a way,” he said. “Johnny and Mayim, you worked together as kids on the show ‘Blossom.’ Johnny was a guest star.”

According to Us Weekly, the stars were barely teenagers then. “First stage kiss for us both,” Galecki said. “It might have been my first real life kiss, also,” recalled Bialik. Bialik played the titular character in the show, which also starred Joey Lawrence, and Jenna von Oÿ.

Kunal Nayyar played the ball and asked the pair to “do it again.” Bialik, the mother of two, and Galecki, had a make out session on the TBS talk show amidst audiences’ cheers. Not to be outdone, Kaley Cuoco and Jim Parsons too got in on some impromptu action, states 9news. “Conan” co-host Andy Richter joked about Bialik’s clothes from the “Blossom” scene after the make-out session, which lasted a bit longer than expected. He asked the star if she was mad that Galecki got a nicer blouse.

“The Big Bang Theory” will celebrate its 200th episode which will be telecast this week. The milestone episode will see 60s Batman star Adam West visiting Sheldon and his pals. Actors Sara Gilbert, Christine Baranski, Wil Wheaton, and John Ross Bowie will return to Pasadena too. Daily Mail informs that Pasadena in LA has declared February 25 the ‘Big Bang Theory Day’ in honour of the show’s 200th episode. The city has even dedicated an alley to the series.