The Obamas with Queen Elizabeth and the Duke of Edinburgh
What to wear to Windsor? With Queen Elizabeth II and the Duke of Edinburgh in the Oak Room at Windsor Castle ahead of a private lunch hosted by the queen in Britain, April 22, 2016. PHOTO: REUTERS/JOHN STILLWELL/POOL

Queen Elizabeth II and her husband Prince Philip greeted U.S. President Barack Obama and first lady Michelle at Windsor Castle on Friday. The U.S. first couple were treated to a lavish special luncheon by the British monarch to celebrate her 90th milestone birthday that was a day before. Prince Philip, the Duke of Edinburgh, drove them over.

Michelle Obama, 52, brought her sartorial style to Windsor dressed in a bright pink and purple patterned dress by Oscar de la Renta. Her demure dress featured a high neck, three-quarter length sleeves and a flared skirt that reached up to her knee. She teamed up her dress with a purple coat.

The mother-of-two accessorized with drop earrings, rings and carried a black leather clutch bag. Michelle completed her look in black high heels. Her make-up consisted of smoky eyes, eyeliner and a slick of pink lipgloss. Michelle’s brunette locks were swept sideways and styled into a bouncy blowout.

The nonagenarian queen was in full form post her birthday in a pale blue skirt suit. Elizabeth’s coat featured long sleeves, matching buttons, an oversize pocket with a bow. The queen accessorized with her favorite jewels including pearl necklace and matching drop earrings. She also wore two brooches and a ring.

The British royal wore black pumps and carried her trusted small black leather handbag. She completed her look with a slick of red lipstick. Philip looked handsome in a navy suit paired with a crisp white shirt, red tie and white pocket square. He completed his look with a pair of black shoes.

President Obama paid a glowing tribute to the queen for her 90th birthday, describing her as an “astonishing person and a real jewel.” He said he had returned to the U.K. as he wanted to wish the queen ‘happy birthday’ in person. He brought along with him a special gift -- a box wrapped in gold paper and embossed with the presidential seal.

Obama and his wife Michelle presented the monarch with a 90th birthday present of a custom photo album chronicling the queen’s visits with U.S. presidents and first ladies to remind her of her trips Stateside. The president jokingly talked about being driven by Philip, saying he had “never been driven by a Duke of Edinburgh before.” Besides, he added that he wished the queen on behalf of all Americans. “She is truly one of my favorite people, and should we be as fortunate to reach 90, may we be as vibrant as she is,” Obama said.