The 26-year-old wrote alongside the post: "My heart is just so full. Thank you to all of those who sprinkled kindness everywhere on my Birthday. Nothing but love for you all."
Richie, 31, fuelled speculation about their split last month when he failed to deny break-up talk, as reported by The Daily Telegraph.
"A downcast Strahan danced around the issue and refused to shut down speculation that the couple had broken up," says the publication.
The long-distance couple recently took solo holidays to the same destination, another red flag according to the report: "the pair were due to travel to South East Asia together recently, instead they took separate holidays."
Tellingly, the reality stars have not appeared in each other's social media feeds. A stark contrast to the early days of their relationship.