October 19, 2015 11:20 AM

Steve Granitz/WireImage

It’s double the joy for Jenni “JWoww” Farley and Roger Mathews.

The couple announced during their wedding reception on Sunday that they’re expecting another baby in May.

They’re already parents to daughter Meilani Alexandra, 15 months.

“Our wedding was everything we could have dreamed of and more. It’s hard for me to determine which was my most favorite moment because there were so many WOW factors to our wedding,” the bride tells PEOPLE exclusively.

“Our wedding planner, Robynne Adoff of Party Extravaganza, really made this entire process flawless. We wanted to announce to all of our guests that we are expecting, [so] Robynne surprised us with her idea of the photo blown up and Meilani being wheeled out in a flowered wagon by Angela’s Fantasy Creations.”

She adds, “Roger and I both cried when we saw the announcement. This was one of the best days of our life.”

The mom-to-be shared the news on her personal page Monday morning.

“IT’S TRUE, WE ARE EXPECTING BABY NUMBER TWO!! (Hey, that rhymes, lol.) So tired from all the wedding fun but wanted to share with you guys the news so you get it from me first,” Farley, 29, wrote on her website.

“I will update you more ASAP. All I know THIS was the hardest secret to ever keep!! We are so excited to share it with you guys, though. And keeping it a secret was worth it for the response last night from all of our family and friends. The best!!!”

This will be the second child for the Jersey Shore alum and her new husband, 40.

“So YES, Meilani is going to be a big sister and we are due in May 2016,” adds Farley. “HAPPIEST DAY OF MY LIFE LAST NIGHT!! (Well, tied with the day Meilani was born) Married to the man of my dreams and the best daddy to my babies!! Can’t wait for you all to see the wedding pictures!”

The pair met during the filming of the MTV reality show, and were engaged in September 2012. On Sunday, they were married in New Jersey in front of family and friends, including castmates Nicole “Snooki” Polizzi and Pauly D.

Entertainment Tonight was first to report the news.

— Sarah Michaud with reporting by Emily Strohm

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