Brooks Nader attends Michael Rubin’s pre-party solo after debuting romance with Prince Constantine Alexios

Brooks Nader was flying solo at Michael Rubin’s pre-Fourth of July party after hard-launching her romance with Prince Constantine Alexios of Greece and Denmark.

The Sports Illustrated model, 27, rocked up to Rubin’s Hamptons mansion without the royal on Wednesday afternoon.

Nader was already on theme for the annual white party in a frilly sundress with a high slit. She paired the summery look with a Birkin in the same hue and strappy heels.

Other stars such as Travis Scott, Quavo, French Montana, Winnie Harlow and Robert Kraft were also there to kick off the weekend festivities.

Droves of celebrities are expected to flock to the Fanatics founder’s water-front property on Thursday for the Fourth.

Rubin’s star-studded 350-person guest list spans from the biggest names in sports to A-list Hollywood stars and the hottest influencers.

Although Alexios didn’t accompany Nader to the pre-party, Rubin may have extended him an invite to draw in the royal attendee.

The 25-year-old prince, who is the eldest son of Crown Prince Pavlos and Crown Princess Marie-Chantal, and his model girlfriend went public with their romance at Olivia Culpo and Christian McCaffrey’s wedding last weekend.

The couple arrived at the Rhode Island nuptials hand-in-hand and were photographed getting cozy inside the reception.

Alexios was seen wrapping his arm around Nader’s waist during the newlyweds’ first dance.

She looked beautiful in a strapless navy blue sequined gown with cut-outs near her hips, while Alexios kept things simple in a black tuxedo.

While it’s unclear when they started dating, the pair sparked romance rumors last month when they were spotted together in New York City.

Nader’s new relationship comes less than two months after Page Six broke the news that she and Billy Haire were divorcing after four years of marriage.

At the time, sources said the amicable exes started living separately towards the beginning of this year.

Since their split, Nader has been spending lots of time in the Hamptons. Although an insider previously told us she was “loving single life” out East, she seems to have already settled down.