• Tom Cruise stopped by Lady Gaga's show in Las Vegas on Sunday
  • Lady Gaga took to Instagram to thank Cruise for his support
  • The singer wrote and produced a song for Cruise's upcoming film

Lady Gaga and Tom Cruise planted kisses on each other's cheeks at the "Bad Romance" singer's Las Vegas show on Sunday.

The "Mission: Impossible" star stopped by the Park MGM hotel to support Lady Gaga, who was performing at the Dolby Live Amphitheater.

Lady Gaga took to Instagram on Monday to share some snaps from the previous night and thank her good friend for supporting her.

"Thank you for coming to the show last night," she captioned the photos. "I love you my friend @tomcruise."

The first photo shows her planting a smooch on Cruise's cheek, with the actor smiling broadly as the award-winning singer kissed him. In the second photo, Cruise returns the favor with a kiss on Lady Gaga's cheek.

Lady Gaga and Cruise's friendship started when they worked together on the upcoming "Top Gun: Maverick." The action film will see Cruise reprise his role as pilot Maverick. The Oscar winner penned the song, "Hold My Hand," for the film's soundtrack.

Lady Gaga last week revealed that her new song would premiere this Tuesday. She also called it a "love letter" to her fans.

"When I wrote this song for 'Top Gun: Maverick,' I didn't even realize the multiple layers it spanned across the film's heart, my own psyche, and the nature of the world we've been living in. I've been working on it for years, perfecting it, trying to make it ours," she wrote on Instagram.

"I wanted to make music into a song where we share our deep need to both be understood and try to understand each other — a longing to be close when we feel so far away and an ability to celebrate life's heroes," she continued, before thanking Cruise.

The singer also shares the trailer of "Top Gun: Maverick" last week on her Twitter page.

"Here we go Tom. So proud to be a part of this," she wrote at the time. "You're gonna love this movie it's outrageously brave, breathtaking and filled with heart. Plus I can't wait for you to hear the song and music I wrote/produced for it! 'Hold My Hand' #TopGun."

Lady Gaga
LONDON, ENGLAND - DECEMBER 05: Singer Lady Gaga attends The Fashion Awards 2016 on December 5, 2016 in London, United Kingdom. Stuart C. Wilson/Getty Images