Sharing the post with his 198,000 Instagram followers, Lewis unveiled a comeback video in which the couple laughed in a cute moment.
In the black-and-white clip, Caroline was wearing a pair of sunglasses and a large coat before stopping abruptly in her tracks as Lewis walked forward.
The couple then started to laugh jokingly in the footage.
“Happy birthday up there,” Lewis wrote alongside the post.
He added: “Miss u x. ”
Lewis was dating Caroline in February 2020 when she tragically committed suicide in her Stoke Newington apartment in London.
The couple were not in touch at the time as Caroline had been prevented from speaking to Lewis during his time on bail.
Just before her death, Caroline had learned that the trial was going on for an alleged attack on her boyfriend Lewis.
Tributes continued to flow for the late Love Island star as her famous friends remember the TV presenter on what would have marked his 41st birthday.
Other celebrities who shared a post for Caroline were Iain Stirling of Love Island, as well as Dawn O’Porter.
Caroline’s girlfriend Louise Redknapp also wrote a touching post in memory of the Love Island star.
“I always want to remember my friend and celebrate her as much as possible and always keep her in all our thoughts and memories,” Louise wrote.
“Happy birthday my dear I miss you coming in and kissing my cheek.” I miss you, love you, ”she concludes.
Olly Murs also marked Caroline’s birthday with a touching message alongside a return photo of the pair.
“Happy birthday cazza! He wrote on his Instagram.
“I wonder most of the time what you see doing tik tok dancing, what Disney song you would sing too, or what random app message I would get from you, but instead I remember the memories we shared laugh you had x miss ya. ”
* Samaritans (116 123) operates a 24 hour service available every day of the year. If you prefer to write down how you feel or are worried about being overheard over the phone, you can email the Samaritans at [email protected]