Princesses Beatrice and Eugenie celebrated Ellie Goulding’s son Arthur’s 2nd birthday bash

Prince Andrew’s daughters were spotted on a star-studded day out in London when they took their kids to Ellie Goulding’s son Arthur’s birthday.

Princess Beatrice, 34, and heavily pregnant Princess Eugenie, 33, took Sienna Mapelli Mozzi and August Brooksbank to Chelsea’s Bluebird Cafe on Monday when Ellie Goulding and Caspar Jopling’s son turned two. Hello! reports.

The sisters are old friends of 36-year-old pop singer Ellie, who attended Princess Eugenie’s wedding in 2018 and has even holidayed with the sisters over the years.

It was a family affair, as the royals were joined by their husbands, Edoardo Mapelli Mozzi, 37, and Jack Brooksbank, 36 — and the brothers-in-law even coordinated their outfits to attend the anniversary.

Both Edo and Jack wore dark jeans, which they paired with matching blue shirts and white T-shirts, and even the same navy baseball caps.

However, their sisters opted for similar but mismatched ensembles when they stepped out for their uncle King Charles’s coronation on Saturday.

Edoardo Mapelli Mozzi (pictured, left) was photographed today with his wife Princess Beatrice (pictured) and their daughter Sienna as they all attended a party in West London

The royal couple made a public appearance at a party in West London's Chelsea just days before the coronation (L-R photo: Edoardo Mapelli Mozzi and Princess Beatrice)

The royal couple made a public appearance at a party in West London’s Chelsea just days before the coronation (L-R photo: Edoardo Mapelli Mozzi and Princess Beatrice)

Eugenie, who is expecting her second child in a few months, wore a blue smock dress from Whistles.

The royal family, who was also joined by the couple’s two-year-old son, August, paired her dress with flat white sneakers and a pair of chic, oversized shades.

She wore her dark brown hair down, let it fall in loose waves and accessorized her outfit with a simple gold chain.

Meanwhile, older sibling Beatrice opted for a navy blue midi dress from Kitri, which she paired with beige sneakers. She was pictured carrying the daughter she shares with husband Edo, year and a half year old Sienna, as she walked down the London street.

Princess Eugenie, who is heavily pregnant with her second child, looked chic in a floral-patterned blue dress from Whistles

Princess Eugenie, who is heavily pregnant with her second child, looked chic in a floral-patterned blue dress from Whistles

The royals attended the Bluebird Café in Chelsea where Ellie Goulding hosted a 2nd birthday party for her son Arthur

The royals attended the Bluebird Café in Chelsea where Ellie Goulding hosted a 2nd birthday party for her son Arthur

Pop singer Ellie, 36, posted a photo to her Instagram Story of herself with her son Arthur as she wished him a happy birthday

Pop singer Ellie, 36, posted a photo to her Instagram Story of herself with her son Arthur as she wished him a happy birthday

Jack Brooksbank (pictured, left), the husband of Princess Eugenie (pictured, back), is seen with their son August.  Jack wears a strikingly similar outfit to his brother-in-law Edo

Jack Brooksbank (pictured, left), the husband of Princess Eugenie (pictured, back), is seen with their son August. Jack wears a strikingly similar outfit to his brother-in-law Edo

The children of both couples – August and Sienna – also wore blue accents in their outfits.

The outing comes just days before King Charles’s coronation, which will take place on May 6.

Both Princess Eugenie and Princess Beatrice are expected to attend the event.

However, their mother Sarah Ferguson, 63, the Duchess of York, has not been invited to the event.

Royal commentator Tom Bower told MailOnline that Sarah had ruled herself out because of her previous ‘behavior’.

He added that her presence would “provoke critical comments that Charles does not need.”

And king expert Richard Fitzwilliams praised the king’s “extremely wise” decision as it has “embarrassed the royal family for years.”

But the apparent decision has taken some royal viewers by surprise — with Meghan Markle’s friend Omid Scobie tweeting, “If true, this feels kind of cruel, doesn’t it?”

Since the censure, the Duchess was spotted in the passenger seat of a Range Rover driven by her ex-husband.