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It's a boy for Cat Deeley!

On Jan. 19, the "So You Think You Can Dance" host announced on Twitter that she had given birth to a healthy baby boy last week.

"Beyond delighted to announce the birth of our baby boy last week," she told her 358,000 followers. "All doing well & we couldn't be happier... 3 really is the magic number!"

It's the first child for her and Patrick Kielty, her husband of nearly four years.

Cat initially announced the pregnancy on Twitter last September, saying, "Exciting news.... Paddy and I are so happy to be expecting our first child in the Spring..... Lucky us."

She then debuted her baby bump at the Emmy Awards a few weeks later.

"No, I'm all actually fine," she told E! of the pregnancy at the awards. "I'm not too bad at all. I'm looking forward though to this week being over so I don't have to wear high heels for a long time. There's been a lots of heels this week."

She added, "I managed to squeeze myself into this Monique Lhuillier gown. We had to let the back out a little bit but everything else is pretty okay. I'm hanging in there."

Fashion remained on the forefront of Cat's mind even as her baby bump grew.

"I managed to get myself into these shoes," she told Wonderwall.com exclusively of the Louis Vutton's she was elegantly rocking at an event in September.

"The shoes are going to be the last thing to go -- over my dead body," she said. "They'll be sending me to the hospital in these shoes."

Not word yet on what shoes she wore to the hospital.