She posted a picture of them together on a luxury break in the Maldives while holding a string of baby scan pictures.
Both dressed in white, 30-year-old Riyad was shown with a protective hand on her baby bump.
Model Taylor, the daughter of Real Housewives of Cheshire star Dawn Ward, wrote: "Where life begins and love never ends.."
The news comes after The Sun revealed that the pair had secretly married under Islamic law.
The couple were quickly congratulated by celebrity pals including Love Island's Molly-Mae Hague who wrote: "Ahhh congratulations!!!."
Olivia Bowen told her friend: "Congratulations princess so happy for you both ."
Taylor is one of 48-year-old Dawn and her 51-year-old ex-footballer husband Ashley Ward's four daughters.
Riyad and Taylor got engaged in June last year while holidaying in Mykonos alongside her parents.
The Man City winger proposed after lunch with a £400,000 ring he had custom made himself.
The pair now live together, moving into a new £2million mansion in Cheshire last year.
Taylor and Riyad got engaged last summer on a trip to Greece