The singer unwittingly revealed his wife's baby bump after posting a photo of the two if them on holiday in Dubai.
The photo was followed with a deep Mother's Day appreciation caption.
Bahati told his wife in a letter: "Dear Diana, You're a Gem. You're Precious. You're a Pillar to Our Family. You're My Prayer Partner."
He continued, "Thank you for giving me a chance to be called a father. Thank you for being the best mum to my kids."
Adding, "In this world no one comes above you. You're part of my heart and soul...HAPPY MOTHERS DAY LOVE ❤️."
Here is the photo of Bahati and Diana showing off her baby bump.