This could put a crimp in Leonard and Penny’s potential honeymoon.

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. And TVLine has learned exclusively that Melissa Tang — AKA Suzanne Taylor on Mom — has landed the plum role.

Tang’s character, Mandy, will turn up in Season 9’s second episode.

The actress’ additional credits include guest stints on How I Met Your Mother and New Girl, as well as a series-regular gig on Fox’s short-lived Goodwin Games.

Meanwhile, TBBT‘s Sept. 21 premiere picks up a few hours after the events of the Season 8 finale, with Leonard and Penny en route to Vegas to tie the knot (but with Leonard’s infidelity threatening to derail the whole shebang).