Maria Menounos gets engaged on 'The Howard Stern Show'

Is Maria Menounos Engaged?

Congrats are in order for Maria Menounos and longtime boyfriend Keven Undergaro -- they're engaged!

Undergaro proposed to the E! News host on Wednesday during her appearance on Howard Stern's SiriusXM radio show, where she was promoting her latest book, The EveryGirl's Guide to Cooking.

"Although I said that this isn't a proposal, I want to ask you something," he said. "Would you make me the happiest man on earth and would you marry me?"

But Menounos wasn't so quick to say yes, instead, asking: "Are you freakin' kidding me right now? Is this a joke?"

See photos of Maria Menounos' engagement ring:

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Maria Menounos engaged
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Maria Menounos gets engaged on 'The Howard Stern Show'
NEW YORK, NY - MARCH 09: (EXCLUSIVE COVERAGE) Maria Menounos and longtime boyfriend Keven Undergaro get engaged on 'The Howard Stern Show' on Howard Stern's exclusive SiriusXM channel Howard 100 at SiriusXM Studios on March 9, 2016 in New York City. (Photo by Slaven Vlasic/Getty Images)
NEW YORK, NY - MARCH 09: (EXCLUSIVE COVERAGE) Maria Menounos and longtime boyfriend Keven Undergaro get engaged on 'The Howard Stern Show' on Howard Stern's exclusive SiriusXM channel Howard 100 at SiriusXM Studios on March 9, 2016 in New York City. (Photo by Slaven Vlasic/Getty Images)
NEW YORK, NY - MARCH 09: (EXCLUSIVE COVERAGE) Maria Menounos (ring detail) and longtime boyfriend Keven Undergaro get engaged on 'The Howard Stern Show' on Howard Stern's exclusive SiriusXM channel Howard 100 at SiriusXM Studios on March 9, 2016 in New York City. (Photo by Slaven Vlasic/Getty Images)
NEW YORK, NY - MARCH 09: Maria Menounos discusses her engagement to longtime boyfriend Keven Undergaro on Jenny McCarthy's exclusive SiriusXM Show 'Dirty, Sexy, Funny with Jenny McCarthy' at SiriusXM Studios on March 9, 2016 in New York City. (Photo by Slaven Vlasic/Getty Images)
NEW YORK, NY - MARCH 09: Maria Menounos (R) discusses her engagement to longtime boyfriend Keven Undergaro on Jenny McCarthy's exclusive SiriusXM Show 'Dirty, Sexy, Funny with Jenny McCarthy' at SiriusXM Studios on March 9, 2016 in New York City. (Photo by Slaven Vlasic/Getty Images)
NEW YORK, NY - MARCH 09: Maria Menounos (R) discusses her engagement to longtime boyfriend Keven Undergaro on Jenny McCarthy's exclusive SiriusXM Show 'Dirty, Sexy, Funny with Jenny McCarthy' at SiriusXM Studios on March 9, 2016 in New York City. (Photo by Slaven Vlasic/Getty Images)
NEW YORK, NY - MARCH 09: Maria Menounos (C) discusses her engagement to longtime boyfriend Keven Undergaro on Jenny McCarthy's exclusive SiriusXM Show 'Dirty, Sexy, Funny with Jenny McCarthy' at SiriusXM Studios on March 9, 2016 in New York City. (Photo by Slaven Vlasic/Getty Images)
NEW YORK, NY - MARCH 09: (EXCLUSIVE COVERAGE) Maria Menounos and longtime boyfriend Keven Undergaro get engaged on 'The Howard Stern Show' on Howard Stern's exclusive SiriusXM channel Howard 100 at SiriusXM Studios on March 9, 2016 in New York City. (Photo by Slaven Vlasic/Getty Images)
NEW YORK, NY - MARCH 09: Maria Menounos (C) discusses her engagement to longtime boyfriend Keven Undergaro on Jenny McCarthy's exclusive SiriusXM Show 'Dirty, Sexy, Funny with Jenny McCarthy' at SiriusXM Studios on March 9, 2016 in New York City. (Photo by Slaven Vlasic/Getty Images)
NEW YORK, NY - MARCH 09: (EXCLUSIVE COVERAGE) Maria Menounos (ring detail) and longtime boyfriend Keven Undergaro get engaged on 'The Howard Stern Show' on Howard Stern's exclusive SiriusXM channel Howard 100 at SiriusXM Studios on March 9, 2016 in New York City. (Photo by Slaven Vlasic/Getty Images)
NEW YORK, NY - MARCH 09: Maria Menounos shows her new engagement ring at AOL Build Speakers Series - to discuss her cookbook 'The EveryGirl's Guide to Cooking'at AOL Studios In New York on March 9, 2016 in New York City. (Photo by Paul Zimmerman/WireImage)
NEW YORK, NY - MARCH 09: Maria Menounos, jewelry detail, discusses her 3rd book release, 'The EveryGirl's Guide to Cooking' at AOL Studios In New York on March 9, 2016 in New York City. (Photo by Mireya Acierto/FilmMagic)
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Of course, Undergaro assured her it wasn't and Menounos, 37, accepted with excitement. "Yes, yes, yes! Oh, my gosh! Of course!" she said. "I can't believe this is happening!"

According to the E!, the film director enlisted French jeweler Jean Dousset to create the custom ring.

The couple have been dating since April 1998 and often work together on the AfterBuzz TV online network.

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