Surprise! Maria Menounos’ boyfriend of 19 years proposes on Howard Stern’s show

Lots of crazy things go down on Howard Stern’s SiriusXM radio show, and on Wednesday morning, Maria Menounos got engaged to longtime boyfriend Keven Undergaro.

The E! News personality, who visited Stern to promote her cookbook, “The EveryGirl’s Guide to Cooking,” was chatting with the shock jock when he brought up the fact that she and Undergaro had been together for 19 years and hadn’t tied the knot -- a recurring question for the couple.

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“At the end of the day, Keven and I are partners in life,” the “Chasing Maria Menounos” star said.

Enter the soon-to-be-fiance.

Stern handed the mic to Undergaro, who reminisced about what the two of them had been through as a couple, braving disapproval from their families because Undergaro wasn’t Greek.

“Although I said that this isn’t a proposal, I want to ask you something, Maria,” Undergaro said, getting down on one knee. “Would you make me the happiest man on Earth? And would you marry me?”

“Are you freaking kidding me right now?!,” the 37-year-old gasped, asking if it was a joke.

“It’s not a joke. This I wouldn’t joke about,” he replied. “I love you so much and this show’s meant so much to both of us. This is the first thing we listened to together 19 years ago in a basement on a twin mattress and I said one day you’ll be on that show and you’ll be a star. And here you are, and here we are. Why not make it official now? Will you honey? Will you accept?”

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Menounos’ disbelief continued as Undergaro tried to get her to believe him, explaining that only her publicist, her dad, Undergaro’s mom, and Stern and his wife, Beth, knew that the proposal was going down.

“Yes, yes, yes of course!,” she screamed. “Oh my God, I can’t even believe this is happening.”

As for the ring: It’s “big,” according to Stern’s co-host, Robin Quivers.

Menounos showed off the ring -- and her excited reaction to the big day -- on Snapchat and E! News.

Her custom bauble was designed by French jeweler Jean Dousset. The designer worked with Undergaro to create the one-of-a-kind confection featuring a round, brilliant-cut center stone set in a seamless halo and surrounded by 220 brilliant-cut diamonds.

“Keven chose to add personal elements to the ring by including a Signature Stone hidden underneath,” the jeweler told the Los Angeles Times in a statement. “The choice of color and origin of the stone adds thoughtful detail only he and Maria will know and see.”

Follow me on Twitter @NardineSaad.