Princess Marie of Denmark was filmed sharing an awkward moment with her husband's ex-wife as they jostled for position at her stepson's graduation.Princess Marie, 42, is the second wife of Prince Joachim of Denmark, 49, and is thought to enjoy a good relationship with his ex Alexandra, the Countess of Frederiksborg, 53, with whom he has two children.But the women appeared slightly tense as they posed for photos with Alexandra and Joachim's eldest son Prince Nikolai, 18, at his high school graduation in Næstved, Denmark, on Wednesday.It is reminiscent of the clip of the awkward moment between Queen Letizia of Spain and her mother-in-law, Queen Sofia, that emerged earlier this year.In the clip of Nikolai's graduation, shared online by Danish news outlet SE og HØR, Marie and Joachim are seen posing with the teenager in the grounds of the prestigious Herlufsholm School.Princess Marie, who has two children with Joachim, wraps her arm around Nikolai's back as a photographer asks to take a photo.Moments later Alexandra can be seen rushing from behind to join the group photo, pulling on Nikolai's arm as she takes her place on the other side of her son.Princess Marie releases her stepson and the women share a look before Alexandra whips off her sunglasses and puts her arm around her son.French-born Marie appeared slightly taken aback by the moment but quickly composed herself and smiled for further photos.Nikolai, who is 7th in line to the throne, signed a modeling contract with Scoop Models in Denmark earlier this year and has already scored career-defining jobs.Last month, he walked in Burberry designer Christopher Bailey's last show for the fashion house, joining Cara Delevingne on the catwalk and strutting his stuff before a front row that included Kate Moss, Naomi Campbell, Michelle Dockery, Naomi Watts, Zendaya, and Idris Elba.Scoop Models revealed the signing on Instagram on February 26, posting several photos of the teen posing with messy brown hair and pouty lips.'The decision was made a while ago with both his parents' support and encouragement.He has signed up with Scoop Models Denmark, and they were the agency which proposed Prince Nikolai,' Scoop Models Agency Director Bente Lundquist told InStyle in a statement.As 7th in line to the Danish throne, he doesn't collect an income from the Crown or have a title or land.He also has not been required by his father, Prince Joachim, to perform any official duties.Nikolai is also the son of Alexandra, Countess of Frederiksborg.The couple had another child together, 15-year-old Prince Felix, before announcing their divorce in 2004 after nine years of marriage.While is mother remarried in 2007 — to Martin Jørgensen, a cinematographer 13 years her junior — the two also divorced in 2015.Nikolai's father, Prince Joachim, married Princess Marie in 2008 and had two more children: eight-year-old Henrik and six-year-old Athena.Nikolai is also the the grandson of Queen Margrethe II.His uncle, Frederik, Crown Pr