The 34-year-old Flip or Flop star is currently visiting England with her British boyfriend.
Christina shared a photo from the couple's romantic vacation on Wednesday.
In the photo, Christina was hugging Ant in casual clothing as they posed in front of an orange and silver race car, which they apparently cruised around the sites in.
"Exploring @ant_anstead old stomping grounds in his race car," the HGTV star captioned the image. "#yesplease. suggestions on must see spots in London appreciated."
Meanwhile, Ant -- who is the mechanic on the Discovery U.K. series, Wheelers and Dealers -- posted the same picture on his own Instagram account.
"Within moments of landing in the U.K. I couldn't help it... we grabbed the G40 and gave @christinaelmoussa a tour of my world... where I grew up, my school, my town, racecar style... but what car tomorrow? #HMF," Ant wrote.
Christina also recently shared a selfie of the couple celebrating St. Patrick's Day together in which she was preparing to give him a kiss on the cheek as they walked down a beachfront boardwalk.
"Luckiest. @Ant_anstead you are #magical," Christina captioned the picture, adding a heart and shamrock emoji.
Reports Christina and Ant are dating first surfaced in early January 2018, when Christina shared a cute selfie of the pair riding bikes together in Newport Beach, CA.
Christina seemed to validate romance rumors when she subsequently commented to nutritionist Cara Clark on her Instagram that they should go on a "double date soon" with their significant others.
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Christina and Tarek share daughter Taylor, 7, and son Brayden, 2, and they continued to film Flip or Flop together despite their failed marriage.
Prior to getting involved with Ant, Christina dated businessman Doug Spedding, but they broke up in October 2017 once he entered rehab to treat his substance abuse issues. She had also been linked to her family's former contractor Gary Anderson.
As for Ant, the motor specialist and car builder split from his wife, Louise Anstead, in July 2017. Ant, 38, also previously hosted For the Love of Cars in the U.K.