“I said yes!!!!” the 33-year-old model captioned a photo with her engagement ring.
Last month, the couple announced that they’re expecting a son, their first child together.
Marcille has a 3-year-old daughter, Marley, with ex Kevin McCall.
“We're Expecting!!!!! 5 months in and we couldn't be more excited!!!” she wrote at the time.
“@miketsterling gets a mini me and #Marley gets a sidekick.”
She’s also scheduled to join the 10th season of “Real Housewives of Atlanta,” making for a busy 2018.