Kate Middleton
Kate Middleton shows off the push present she received from Prince William after giving birth to Prince Louis. Pictured: Middleton and Prince William pass British Prime Minister Theresa May and her husband Philip May as they attend the Men's Singles final on day thirteen of the Wimbledon Lawn Tennis Championships at All England Lawn Tennis and Croquet Club on July 15, 2018 in London. Getty Images/Clive Brunskill

Kate Middleton sported a yellow ring to match her dress when she attended Wimbledon with husband Prince William.

The Duke and Duchess of Cambridge stepped out together on Sunday to watch the men's final in the tennis tournament, where Middleton stunned in her yellow dress. However, royal fans also noticed the citrine ring on her right hand. The royal mom of three also wore her iconic blue sapphire diamond engagement ring and wedding band on the left.

According to Alice Scarsi, a journalist for Daily Express, the citrine ring was a "push present" from Prince William after Middleton safely delivered their third child in April. The duke also gave his wife a gift after she gave birth to Princess Charlotte in 2015.

After their second's child birth, Prince William opted to give Middleton a pair of green tourmaline, green amethyst and diamond earrings. The present was especially made for the Duchess of Cambridge by Kiki McDonough.

At the moment, Middleton is still on maternity leave. She's not expected to return to her royal duties until October. However, she's been seen out and about more often lately.

Last week, Middleton reunited with the other members of the royal family for Prince Louis' christening. It was the first time that the Cambridges' family of five was spotted together.

Also present during the event were Prince Charles, Camilla Parker Bowles, Prince Harry and Meghan Markle. Middleton's family, Carole, Michael and Pippa Middleton, were in attendance as well. Pippa, who is expecting her first child, arrived at the venue with husband James Matthews.

The following day, Middleton joined the royals again for the Royal Air Force centenary celebration. It was the last time the fab four was spotted together again. Initially, Middleton was not expected to join the event, but she broke her maternity leave because she "felt the celebration was important to be at if she was feeling up to it."

On Saturday, Middleton stepped out again with her sister-in-law. The two duchesses watched the women's finals. Both were moved with Serena William's speech after she lost the match to Angelique Kerber.

"It was such an amazing tournament for me. I was really hoping to get this far," Williams said. "It's obviously disappointing, but I can't be disappointed. I have so much to look forward to. I'm literally just getting started. To all the moms out there, I was playing for you today and I tried."