The latest “The Big Bang Theory” season 9 spoilers revealed that the woman Leonard (Johnny Galecki) cheated with will finally be revealed in the coming episodes. In the season 8 finale, the physicist told his fiancé Penny (Kaley Cuoco-Sweeting) that he kissed another girl while he was on the North Sea expedition. He said that he did not want to start their marriage carrying a big secret.

New reports claim that Penny and Leonard may eventually get married in the season 9 premiere. "The Big Bang Theory" fans have long awaited this moment and it seems like it is finally going to happen. Spoilers indicate that the two lovebirds will reach Las Vegas and even hire a minister.

Penny, however, could still not get over the fact that Leonard cheated on her. It was said that the mystery girl will be revealed to the viewers in the second episode.

"The Big Bang Theory has decided to throw kerosene on the fire by introducing the woman Leonard kissed while on that North Sea expedition - an indiscretion Penny was made privy to on the eve of the couple's elopement. Melissa Tang - AKA Suzanne Taylor on 'Mom' - has landed the plum role," reported TV Line.

It is, however, unclear if Tang's character Mandy will appear in a flashback episode or if they she will have an actual confrontation with Penny.

The official synopsis confirmed that Penny and Leonard will get to walk down the aisle this time around. The only problem is Penny may just not be over her fiancé's infidelity.

"In Las Vegas, Penny and Leonard march closer to marching down the aisle, but has Penny gotten over Leonard's infidelity? And if so, will he do anything to un-get her over it?" read the official synopsis from TV Line.

Tune in for more "The Big Bang Theory" season 9 spoilers, news and cast updates.