"2 Broke Girls," "Castle" air season finales tonight

(CBS News) It's the month of May, which means April showers are over and it's time for a slew of TV season finales.

On Monday night, "2 Broke Girls" and "Castle" will finish their respective first and fourth seasons.

Martha Stewart will make an appearance on the "2 Broke Girls" season finale, which airs at 8 p.m. EDT on CBS. In the hour-long episode, the titular broke girls, Max (Kat Dennings) and Caroline (Beth Behrs), who dream of opening a cupcake shop, decide to crash a gala at the Metropolitan Museum of Art in hopes of having Stewart taste one of their confections.

The season finale of "Castle" (10 p.m. EDT on ABC) promises big developments for Castle (Nathan Fillion) and Beckett (Stana Katic), who must confront the issues between them when they deal with a case that has ties to Beckett's shooting and her mother's murder.

Fans are also eager to see whether this is the episode in which the duo will finally take their relationship to the next level.

"A television series is a lot like life. Things tend to drag on and on...and then happen very quickly," Fillion told TVGuide magazine in response to the buzz that viewers will get the long-awaited "Caskett" hookup.

Executive producer Andrew Marlowe wouldn't confirm a hookup is happening, but he didn't deny it either.

"Castle and Beckett leave the finale knowing how they feel about each other and dealing with the ramifications of what that means," Marlowe told TVGuide. "If indeed there is a hookup, we have to handle it in a way that's honest for both characters and satisfying to our fans."

Tell us: Will you tune in for these season finales?