Spain's Queen Letizia and King Felipe attended Rod Stewart's concert in Madrid earlier this week.

Queen Letizia

Queen Letizia

The royal couple - who got married in 2004 - snuck into the show at the Teatro Real, a major opera house, through a side door and sung the night away with other attendees.

Letizia, who was dressed to impress in a skimpy black dress, couldn't resist documenting the event on her phone as she pulled out her device and began snapping away.

However, the couple may have been enjoying themselves but, according to HELLO! magazine, they refused to get up and dance and, instead, sang along to the lyrics.

Meanwhile, it's been a busy few months for the pair as earlier this year they spent three days in the UK.

The duo rubbed shoulders with British royalty - such as Queen Elizabeth and Prince Philip - when they resided at Windsor Castle in Berkshire, south east England.

And King Felipe and Queen Letizia aren't the only Spanish royals to waltz across to the UK as King Juan Carlos and Queen Sofia also stopped by in 1986.

Two years later, Queen Elizabeth and the Duke of Edinburgh returned the favour by heading over to Spain in 1988.

Letizia is used to mixing with important people and in September she spent her birthday with US President Barack Obama and his wife Michelle.

The royal celebrated the milestone by touring the White House in Washington, DC with her husband after starting the day with a visit to Mount Vernon, the home of the George Washington.

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