Christina, who shares daughter Taylor and son Brayden with her ex-husband, Tarek El Moussa, revealed the happy news on Instagram. Ant is already a father of two as well; he shares a son, Archie, and daughter, Amelie, with his first wife, Louise.
The Flip or Flop star debuted the smallest of baby bumps on Friday, as she sported black leggings and a form-fitting long-sleeved T-shirt.
"@ant_anstead and I are so excited to announce #babyanstead coming this September!! The kids are all so excited to meet their new sibling ♥️ #5 #Gonnaneedabiggercar! ? ?," Christina wrote on Instagram in her pregnancy announcement on Friday.
On Saturday, she thanked fans for their support while praising her daughter, Taylor. "Love this happy, feisty girl. I became a big sister at age 10 and I love the bond I have with my sister @carly.haack ... Tay is so excited she will be a big sis Again at age 9. ♥️ thank you so much for all the sweet messages.. we really appreciate all the love and support!" she said.