Kate Gosselin displayed her hot body in bikini-and showing off what ex Jon Gosselin is missing-while celebrating her 40th birthday in a resort in Mexico.

In the clip shared by Entertainment Weekly, her eight kids are seen preparing an ocean-themed birthday cake for their mom.

Leah comments in the "Kate Plus 8" clip, "She's not going to like the fact there's a 40 on it but she can deal with it."

In the next sequence, Kate Gosselin can be seen in a hot bikini with a purple top and multi-colored bottom while she watches over the kids.

"At this point in time, I discovered the little cabanas and let me tell you something, once I laid down I decided that I instantly need three more days to try out those things," Kate Gosselin says. "So comfortable, it was the relaxation I needed after that busy trip."

Since their divorce in 2009, Jon Gosselin and Kate Gosselin have moved on to their respective lives.

"Kate has become even more famous thanks to her spinoffs with TLC as well as being a contestant on ABC's Dancing With The Stars in 2010 and also starring on this year's Celebrity Apprentice," said Daily Mail.

"Jon, meanwhile, has struggled to get by with menial jobs, though things have looked up for him this summer with a DJ gig in Atlantic City," it added.

The aftermath of their divorce has not been a pleasant one as Jon Gosselin reportedly filed custody claims against the "Kate Plus 8" star. They have eight children together, the twins Cara and Madelyn, both 14, and the sextuplets, Leah, Alexis, Hannah, Aaden, Collin and Joel, all 11 years old.

Kate Gosselin also says in the "Kate Plus 8" clip that she's never been happier since the divorce. When the subject of Jon Gosselin came up, she says, "Don't talk to me about ex situations. I don't define myself with that."