Goal! Prince William Attends England's Final Group Game Against Czech Republic At Wembley Stadium — Photos

Prince William attended England's final group game against Czech Republic at Wembley Stadium. See photos!

He's one happy camper! Prince William took time out of his day to cheer on the Three Lions at Wembley Stadium in London, England, on June 22.

Clearly, the Duke of Cambridge — who is also President of The Football Association — is invested in the soccer match, as last week he sent out a message about the current competition.

"Finally it’s here! #Euro2020," he wrote from his official Twitter account. "Wishing all the best to the Home Nations competing this summer — looking forward to a fantastic tournament!"

Scroll through the gallery below to see William's day out!

William — who wore a blue suit with a tie — looked rather serious at the game.

The outing was a sweet birthday treat for the royal, who just turned 39 on June 21.

Fans loved seeing William out and about. "Yes William, bring us some luck!" one person wrote, while another added, "Is Prince William singing God save the Queen the most natural thing ever or the most surreal thing ever?"

"It's lovely seeing the Duke of Cambridge Prince William at the football [game] tonight, Czech Rep v England. Good luck England," a third person noted.

In honor of William's big day, Queen Elizabeth and Prince Charles sent the dad-of-three some kind messages.

"Wishing The Duke of Cambridge a very Happy Birthday today! #HappyBirthdayHRH," the caption read from the Queen's Twitter account.

"Wishing The Duke of Cambridge a very Happy Birthday today! ?," Charles and Camilla wrote.

"Thank you for all the birthday wishes and kind messages ?," William posted on his own account.

"Kate always makes birthdays and celebrations special for William and the children," royal expert Katie Nicholl told OK! magazine. "She's very much like her mother Carole [Middleton] in that respect. She'll be aware that this year has been tough for William and will want both his birthday and Father's Day to be special for him."

"Kate keeps William very grounded and she likes to show how important he is to her and the children," she added. "Especially after everything they've been through this year. It's only brought them closer."