Sean Lowe and Catherine Giudici of "The Bachelor" are expecting...

Sean Lowe and Catherine Giudici of "The Bachelor" are expecting their first child together. Here, they attend the Disney ABC Television Group's 2014 winter TCA party held at The Langham Huntington Hotel and Spa in Pasadena, California, on Jan. 17, 2014. Credit: Getty Images / Tommaso Boddi

Season 17 “The Bachelor” star Sean Lowe has thanked well-wishers responding to news that he and his wife, Catherine Giudici, are expecting their first child.

“Thank you to everyone for the kind words today!” Lowe, 32, tweeted. “Catherine and I are so excited!”

On Tuesday, the real-estate developer had posted an Instagram image of himself and Giudici — to whom he proposed on the March 2013 finale and married the following year — sitting together on a couch, with his hand on her belly. “It’s happening! I’m going to be a dad!” he wrote. Simultaneously, Giudici, 29, posted a black-and-white Instagram image from the same series, captioned, “Hey baby :)”

She had posted an April Fool’s prank on Instagram this year, saying she was 17 weeks along before revealing she was joking.

The couple, who married in January 2014 in a live, televised wedding, is one of five from the “Bachelor” and “Bachelorette” franchise to have married after on-air proposals. The others are: Ashley Hebert and the Roslyn-raised J.P. Rosenbaum from “The Bachelorette” Season 7, who have one child; Trista Rehn and Ryan Sutter, from that show’s first season, who have two; Jason Mesnick and Molly Malaney, from “The Bachelor” Season 13; and Desiree Hartsock and Chris Siegfried from “The Bachelorette” Season 9.

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