Margaret Qualley and Jack Antonoff get engaged after debut at Cannes Film Festival

Margaret Cooley is engaged to her musician boyfriend Jack Antonov.

The 27-year-old actress and the 38-year-old music producer have decided to take the next step in their relationship, a source has revealed people on Monday.

So far, a representative for the couple has not commented on the reported engagement.

Get serious: Margaret Cooley, 27, and her musician boyfriend Jack Antonov, 38, are engaged, a source told PEOPLE on Monday. Seen in Los Angeles on March 13

Get serious: Margaret Cooley, 27, and her musician boyfriend Jack Antonov, 38, are engaged, a source told PEOPLE on Monday. Seen in Los Angeles on March 13

However, Margaret sparked rumors at the Cannes premiere on Wednesday that she appeared to have a sizable diamond on her left ring finger when her film “Noonday Star” debuted.

Directed by French film icon Claire Denis and based on Dennis Johnson’s novel of the same name, the film received mostly positive reviews, although some critics said Margaret and co-star Joe Alwyn lacked chemistry.

Ahead of the premiere, she also appeared in a short for Chanel in which she rested her chin on her left hand, highlighting the ring.

The actress, daughter of fellow screen star Andie McDowell, has been linked with Jack since the summer of 2021.

They confirmed they were dating in August, when they were spotted kissing and hugging while strolling around New York City.

Sparkler: Margaret sparked rumors at Cannes premiere Wednesday that she appeared to have a diamond on her left ring finger when her film

Sparkler: Margaret sparked rumors at Cannes premiere Wednesday that she appeared to have a diamond on her left ring finger when her film “Noonday Star” debuted; seen Thursday

Hint Hint!She also appeared in a short Chanel clip ahead of the premiere where she rested her chin on her left hand and highlighted the ring; see you Wednesday

Hint Hint!She also appeared in a short Chanel clip ahead of the premiere where she rested her chin on her left hand and highlighted the ring; see you Wednesday

Although they haven’t made it clear about the status of their relationship in months, they looked loving when they attended the AFI Awards luncheon together in Beverly Hills this March.

Two days later, they were spotted sharing a kiss at the Critics’ Choice Awards, despite Margaret walking the red carpet alone at the time.

The state of their relationship was no longer muddled when the Leftovers star posted an adorable photo of the pair embracing after the awards ceremony on Instagram, with the caption “date night.”

Margaret was with her boyfriend at the Grammys in Las Vegas last month, where he was credited for making Taylor Swift’s acclaimed album Evermore. won the coveted Album of the Year award.

It's official: The two of them were seen kissing in New York in August 2021, and Margaret posted a photo of them at the Critics' Choice Awards in March and captioned them

It’s official: The two of them were seen kissing in New York in August 2021, and Margaret posted a photo of them at the Critics’ Choice Awards in March and captioned them “date night” ‘s title, confirming they are a project; seen April 3 in Las Vegas

The newly engaged couple has several high-profile relationships in their rearview mirrors.

After going on a blind date in 2012, Jack dated writer-director-actress Lena Dunham for six years.

They were together at the height of her fame, while writing and starring in HBO’s Girls, but the couple ended their relationship in early 2018.

Back in high school, the singer-songwriter briefly dated future Marvel star Scarlett Johansson and hooked up with model Carlo Thacker after her split from Dunham.

Ex: Jake has been dating Lena Dunham for six years, starting on a blind date in 2012.They split in early 2018; met in 2017

Ex: Jake has been dating Lena Dunham for six years, starting on a blind date in 2012.They split in early 2018; met in 2017

Margaret has her own star exes, including actor Nat Wolfe.

The pair met on the set of Palo Alto in 2013, but it’s unclear when their relationship began.

By 2017, when she referred to him as an “ex-boyfriend” in an interview, it seemed to be over Fashion.

She and SNL star Pete Davidson were briefly linked in late 2019 when they were spotted flaunting PDA on multiple occasions, but the relationship appeared to be short-lived and they appeared to split later that year.

Her most recent relationship was with Shia LaBeouf in 2020.

They met while filming a music video for her sister Rainey Qualley, and then they looked loving in December.

But in January, the Transformers star was accused of abuse by his ex-girlfriend, singer FKA twigs. Although Margaret was still seen as in love with the actor shortly after the allegations became public, they parted ways a few days later.

Early years: Margaret had her own star predecessors, including actor Nat Wolfe.The pair met on the set of Palo Alto in 2013 and split sometime in 2017; seen in New York City in August 2017

Early years: Margaret had her own star predecessors, including actor Nat Wolfe.The pair met on the set of Palo Alto in 2013 and split sometime in 2017; seen in New York City in August 2017

She and SNL star Pete Davidson were photographed showing off PDA several times in late 2019, but their relationship appears to be short-lived; pictured with Anthony Mackie (left) in Venice in 2019

She and SNL star Pete Davidson were photographed showing off PDA several times in late 2019, but their relationship appears to be short-lived; pictured with Anthony Mackie (left) in Venice in 2019

CUT: Margaret started dating Shia LaBeouf in late 2020, but split in January 2021 after his ex-FKA twigs publicly accused him of abuse; seen in Los Angeles in December

CUT: Margaret started dating Shia LaBeouf in late 2020, but split in January 2021 after his ex-FKA twigs publicly accused him of abuse; seen in Los Angeles in December