Stepbrother of Princess Tatiana of Greece and Denmark mysteriously goes missing in Malibu after disappearing in the middle of the night

A 53-year-old man with ties to Europe's Princess Tatiana is missing after vanishing in the middle of the night in Malibu. 

Attilio Brillembourg III was last seen at around 1am in the early hours of Saturday morning in the 6000 block of Murphy Way, a neighborhood of luxury homes and estates near Escondido Falls.

He is the son of Princess Tatiana's former stepfather, Attilio Brillembourg, who was previously married to her mother and accompanied her at her 2010 wedding to Prince Nikolaos of Greece. 

The younger Brillembourg, once linked to Charlie Chaplin's granddaughter Kiera, was said to have been wearing a blue shirt, gray pants but no shoes.

The area where he vanished is particularly rural with steep hillsides and no streetlights at night. 

Details regarding the circumstances of his disappearance have not been disclosed.

'There is concern for Mr. Brillembourg's well-being,' the Sheriff's Department said in its missing person report

Tatiana Blatnik and her stepfather Atilio Brillembourg are seen at her 2010 wedding in Spetses, Greece. Brillembourg's son is now missing in Malibu 

Attilio Brillembourg with ties to European royalty was last seen in the 6000 block of Murphy Way in Malibu just after 1am

Brillembourg is described as a white male, 5 feet 10 inches tall, weighing 165 pounds, with gray hair, green eyes, and a tattoo on his upper thigh. 

He was once married to Tatiana's mother, Marie-Blanche Brillembourg, but the pair are understood to have separated. 

Her father, Ladislav Vladimir Blatnik, died when she was a child.  

'There is concern for Mr. Brillembourg's well-being,' the Sheriff's Department  said in its missing person report.

Brillembourg is the stepfather of Princess Tatiana, a 43-year-old member of the Greek and Danish royal families, who was born in Venezuela. 

The LASD says Brillembourg no longer has ties to the family. 

Pictured: Tatiana Blatnik and her stepfather Atilio Brillembourg in 2010

Pictured (L-R) Marie-Blanche Brillembourg, Prince Nikolaos, Tatiana Blatnik, and Atilio Brillembourg in August 2010

Pictured: Actress Kiera Chaplin and Attilio Brillembourg seen in 2009 in Capri

The area pictured on Sunday, about a day after Brillembourg's disappearance 

Brillembourg was last seen wearing a blue shirt, gray pants but no shoes. Pictured, Murphy Way where he was last seen in the early hours of Saturday morning

Princess Tatiana is married to Prince Nikolaos, the son of Constantine II, who was the king of Greece until the monarchy was abolished in 1973. 

The couple, who married in August 2010, announced their separation last month however, Tatiana, retained her royal title.

The wedding - which was described as 'Mamma Mia, but with aristocrats' - was attended by royalty from around the world, including monarchies from the Netherlands, Denmark, Sweden and Spain. 

Princess Tatiana, whose full name is Tatiana Blatnik, is known as an entrepreneur, author and philanthropist.

She is also the founder of Breathe, a non-profit organization dedicated to raising awareness around mental health and building healthier, more compassionate communities.

Anyone with information regarding Attilio Brillembourg's disappearance is asked to contact LASD’s Homicide Bureau at 323-890-5500. 

After almost 14 years of marriage, Princess Tatiana and Prince Nikolaos shocked royal fans as they unexpectedly announced their separation on April 19. Above: The pair pictured in 2011