"Nothing is ever really lost. welcome back," Fox wrote while referencing song lyrics from Kelly's "last november," a song about his and Fox's past pregnancy loss.

Megan Fox is pregnant. The actress took to Instagram on Monday to share that she is expecting her first child with Machine Gun Kelly after the couple suffered a miscarriage earlier in their relationship.

Megan Fox is expecting her fourth baby, her first with fiancé Machine Gun Kelly. Fox is already mom to three sons, while Machine Gun Kelly is dad to one daughter.