However, despite the obvious piece of jewellery, the actress's rep has rubbished claims that she is engaged to her boyfriend, French journalist Romain Dauriac. A representative for Johansson confirmed to MailOnline on Friday that she is "not engaged or close to being engaged", refuting reports from People.com.

As for the ring, which she has been spotted wearing on multiple occasions in recent months, a source told People that it was just "a piece of jewellery". To go with the glamorous accessory, the makeup-free Vicky Cristina Barcelona star opted for a casual look on her recent flight, including black tights, trendy patterned sneakers and a New York Yankees cap.

Her simple black sweater reads “Paris,” a fitting tribute to her current partner. Scarlett and Romain, a former editor at French magazine Clark, known for his focus on underground urban art, are both acquainted with French tattoo artist Fuzi, who recently inked a horseshoe and the phrase “Lucky You” on Scarlett’s ribcage.

The Lost In Translation star boasts an impressive collection of tattoos, including “I Heart New York,” which she had inked on her right wrist last year. The creative design resembles a bracelet, with a subtle tribute to New York City cleverly embedded within. If the couple decide to tie the knot, it will be Scarlett’s second marriage, after she split from first husband Ryan Reynolds in December 2010 after two years of marriage. He is currently married to Blake Lively, and they are currently facing rumors of expecting a child.

Earlier this year, the Golden Globe nominee told UK Elle that marriage is not an important goal for her. "It's really not important to me," Johansson stated. She added, "The only time I think about it is when people ask me, 'Am I getting married again?'" As for her future plans for motherhood, she commented, "I'm not having kids anytime soon. I'm in a great relationship, I'm working a lot and, like I said, it's not important to me."

On the professional front, Scarlett recently began filming her new project, Chef, in Los Angeles, where she'll be wearing a brunette Bettie Page wig alongside Jon Favreau. The film follows the journey of Carl Casper, played by Favreau, who loses his job as a chef and starts a food truck business to regain his artistic aspirations. Joining Scarlett in the cast will be respected actors Robert Downey Jr., Sofia Vergara and John Leguizamo.