Sean Lowe and Catherine Giudici are expecting baby No. 2.

The 33-year-old "The Bachelor" Season 17 star announced in a tweet Friday that Giudici is pregnant with their second child.

"Our lives did a 180 when we had our first kid. Hope the next kid does the same so our lives will get back to normal. #geometry," he wrote.

Lowe and Giudici already share 16-month-old son Samuel Thomas.

Lowe shared a cute video on Instagram of the toddler saying "baby" and pointing to Giudici's growing belly.

"It's happening!" he captioned the clip.

Giudici also posted a photo on her own account of Samuel sitting on her lap and pointing to her baby bump.

"BABA NUMBA TWO," she wrote.

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Lowe and Giudici met on "The Bachelor" Season 17, and got engaged on the season finale, which aired in March 2013.

The couple married in Santa Barbara, Calif., in January 2014, and welcomed Samuel in July 2016.

"I feel like because Samuel might jump out of his crib any day now and crawl out of it, it might be time for the big boy room," Giudici told Us Weekly in October.

"The nursery is pretty set in case baby number two comes around any time soon but I am excited about creating a big boy room for Samuel," she said.