Watch: Roger Federer discusses his love for hiking with Anne Hathaway, tries to sing along to Britney Spears' "Oops... I did it again"

Roger Federer and Anne Hathaway recently starred in a commercial for Swiss Tourism that went viral on social media. The 20-time Grand Slam champion is a brand ambassador for his country's tourism industry, and the ad with Hathaway was the latest in a series of high-profile campaigns he has been a part of since 2021.

On Wednesday, the former World No. 1 took to Instagram to share a special behind-the-scenes video from the shoot. Hathaway and Federer asked each other a series of casual questions in the clip, revolving around their experiences with roadtrips.

The Swiss maestro revealed that he has always liked traveling, a sentiment that was nurtured by his early days hiking. The World No. 41 noted that he often used to go on camping trips in the Swiss mountains with his parents as his father believed it would help him spend more time with his children.

"I loved going hiking. It's a childhood memory I have vividly. Early on, I was young and learned how to make fire, grill sausages and bring bread along... I loved it. And the summer in the mountains is terrific," Federer said. "You can forget about everything. My dad used to say, "When you walk, you talk." I think it gave him a lot of time to spend with his children and talk to them. I used to love that."

When it was his turn to post a query to Anne Hathaway, the 40-year-old asked her which three celebrities she would like to go on a roadtrip with. The actress picked comedian Sarah Silverman and singers Adele and Dolly Parton.

"I think Adele. She can both speak to me and sing. She's so charming," Hathaway said. "Then, Sarah Silverman and Dolly Parton."

Unfortunately, the Swiss was not familiar with who Parton was. After Hathaway did her best to explain who the legend was, Federer jokingly begged her not to ask him any more questions since he felt embarrassed about his lack of pop culture knowledge.

"Don't ask me any more questions please," the Swiss joked. "Why am I sweating."

The American let off the 20-time Grand Slam champion with one final question, probing him on what kind of music he listens to when on a roadtrip. The former World No. 1 disclosed that he likes to have Queen, Bon Jovi, a Swedish pop rock band called Roxette and the Backstreet Boys on in the background, as well as some Britney Spears.

"I sing in the car when I travel, but badly. I like to listen to Queen, Bon Jovi, Roxette -- a Swedish band," Federer said. "Backstreet boys, because why not? I think that's a singalong right there. A little bit of Britney Spears [too], I remember teaching my kiddies."

It was at this point that Hathway requested Federer to show off his singing skills, to which the 40-year-old surprisingly obliged. The performance didn't last long though, with the former World No. 1 singing only a couple of words from Spear's hit single "Oops... I did it again.

"You're the most fun! You did it! Oh my god! I can't believe you did it!" Hathway noted with amazement.

Roger Federer receives honorary award at Swiss Sports Awards after retirement

Roger Federer at the Laver Cup 2022

After hanging up his racquet at the 2022 Laver Cup in an emotional farewell ceremony, Roger Federer made an appearance at the Swiss Sports Awards in Zurich, where he received an honorary award for his years of service to Swiss tennis.

The 20-time Grand Slam champion became the sixth person in history to be bestowed the award upon, following in the footsteps of legends such as Res Brugger (track and field), Ferdi Kubler (cycling) and others.