The Flip or Flop star posted a video on Instagram on Saturday, in which he opened up about Christina's newborn son, Hudson, as his 8-year-old daughter, Taylor, was about to play her first soccer game of the season.
"I'm sooo excited that soccer is back!!! It's so much fun to watch her play and cheer her on!!" he proudly wrote. "This little girl right here makes daddy so proud! She works so hard!"
Then, he added that Taylor has already met his new half-brother and was "thrilled" by the experience, a special moment which Christina shared a photo of on Saturday as well.
Tarek continued in the caption: "I can't wait to meet the little guy also! If Christina and Ant pay well I may baby sit?."
Christina revealed to fans on Friday that she and her husband welcomed their bundle of joy with a tender post featuring a photo of the couple in the hospital with their newborn.
"Ant and I are so excited to welcome Hudson London Anstead into the world," she wrote alongside the pic. "Our hearts are SO full of love and joy! ? Our healthy baby boy was born this morning- 9/6/19 - 7 lbs 7 oz 19.5 inches long."
Tarek filed for divorce from Christina in January 2017, and the divorce was finalized a year later. Besides Taylor, they share a 4-year-old son, Brayden.
Tarek concluded his Saturday post by revealing that he's taking his family to Catalina Island with his new girlfriend, Heather Rae Young, who stars on Selling Sunset.
The new couple made their red carpet debut at the A Very Brady Renovation premiere on Thursday, during which Tarek shared the details of his new ladylove's first meeting with his ex and Ant.
"It all worked out great. I kind of threw that at them last minute," he told ET. "I didn't tell her much. I was like, 'Hey, you're going to meet my friend' and 'Hey, you're going to meet my ex-wife.' I threw them together in the same room, next thing I knew they were talking about vegan food and running, so it worked out great."
Heather also chimed in: "We got along great. She's super sweet. We had fun."
"You know, I was a guy that lost everything," he admitted. "I hit rock bottom. You know, I was at the lowest, lowest, lowest point in my life to the point where I could barely get out of bed and today, I hop out of bed -- mostly because I have a very obnoxious alarm -- but I do hop out of bed, yeah."
He later added: "Things have changed. Things are good. I'm really happy."