Michael B. Jordan; Lori Harvey.Photo: Randy Holmes/ABC via Getty Images; Prince Williams/WireImage

Michael B. Jordan, Lori Harvey

Michael B. Jordansent a sweet birthday message to his girlfriendLori Harvey, who turned 24 on Wednesday.

Harvey shared aphoto of herself on Instagramrocking a Vivienne Westwood corset top, white leggings and pearl jewelry, with her hair slicked back into a long braided ponytail.

In the pictures, the birthday girl played with cake and posed in her vintage outfit.

“24 🎂,” she captioned her first set of photos.

Lala Anthony,Chloe x HalleandAshley Grahamwere among her many friends to comment along with her boyfriend, PEOPLE’s Sexiest Man Alive, 33.

“Gimmie!! 🤤🤤Sheeesh!!” Jordan commented.

He also revealed his pet name for Harvey, writing, “Happy Birthday Turtle!!”

RELATED VIDEO: Michael B. Jordan Goes Instagram Official with Lori Harvey After Months of Romance Rumors

“Thank you nugget,“Steveand Marjorie Harvey’s daughter said in response.

The flirty exchange comes just days afterthe pair went Instagram official.

On Sunday, Jordan and Harvey posted photos of theBlack Pantherstar giving the now-24-year-old a sweet kiss on the cheek.

The post came as no shock to fans who have been speculating on their romance for months.

“It seems they have wanted to get to know each other in private,“a source tells PEOPLEof the couple in this week’s issue. “They have been careful about being photographed together.”

Harvey has been previously linked to musiciansFuture,Trey SongzandDiddyand was previously engaged to Dutch soccer pro Memphis Depay.

“In the past she quickly posted social media pictures with guys that she was dating,” says the source. “With Michael she has tried a different approach.”

The source adds the couple “spent all the major holidays together in November and December” and “Lori seems very happy.”

For more about Michael B. Jordan and Lori Harvey pick up the latest issue of PEOPLE, on newsstands Friday.

In November, theJust Mercystar told PEOPLE aboutwhat he’s seeking when it comes to romance.

“A sense of humor, true understanding, because [an actor’s] life is not conducive to a relationship — it’s really not,” he said of the qualities he’s looking for.

“Somebody that’s nurturing. I’ve got a list. That’s probably why my ass is still single, but yeah, it’s a list,” Jordan added.

When it comes to his ideal date, the actor said first and foremost “not worry about paparazzi.”

“Enjoy somebody’s company. Go for a drive, dope playlist. Drive somewhere just for dessert,” Jordan said. “I’m definitely a movie guy, and then I’d ride the vibe for the rest of the night.”

source: people.com