Sizzling hot! Are Cristiano Ronaldo and Alessandra Ambrosio hooking up? Well, putting malice aside, the 31-year-old Real Madrid superstar and 34-year-old Victoria's Secret model have recently teamed up for GQ magazine's Body Issue. On the cover, both stars stripped off their tops and were only seen wearing their underwear.

In a video clip shared via Twitter in October 2015, Ronaldo and Ambrosio teased their fans about a top secret collaboration, Daily Mirror noted.

"Hi guys, we've finished photo-shooting, it was amazing filming with Alessandra, she is fantastic, she does a fantastic job. We are not going to say what we did because it's a secret, we hope you are going to like it," the Real Madrid forward said in the short video.

Ambrosio added, "I had a great time with you. You're an amazing person, a super-nice guy and I hope you guys have fun and it's a top secret project so you're not going to find out."

While the pair looked good together in their racy fitness-inspired GQ cover shoot, they are not romantically involved with each other.

As a matter of fact, Ambrosio, who has been modelling for Victoria's Secret since 2004, has been in a relationship with her long-time partner and businessman Jamie Mazur since 2005.

Ambrosio and Mazur have been proud parents to 8-year-old Anja and 4-year-old Noah. Daily Mail also added the hot Brazilian supermodel is also a friend of Ronaldo's ex-girlfriend Irina Shayk, who's currently dating Hollywood actor Bradley Cooper.

As for the Portuguese footballer, he was seen with a number of women since his breakup with five-year girlfriend Shayk last year. Among his reported hookups were with Spanish TV reporter Lucia Villalon and Marisa Mendes, the daughter of super-agent Jorge Mendes.

Meanwhile, Ronaldo has been making a lot of women swoon with his good looks and athleticism on the field while playing for the Spanish soccer team, Real Madrid.

Though he had previously ruled out a move in the United States in November, a recent interview suggested that the Portuguese footballer is considering to play in America just like British football superstar David Beckham.

"In my mind I want to finish in the top level, I want to finish with dignity so in a good club," Ronaldo told Jonathan Ross in November. "It doesn't mean that to go USA or Qatar or Dubai is not good but I don't see myself [going there]."

Ronaldo has been linked with a return to England and French champions PSG, but he also believed he could play his trade in MLS in the future.

"Maybe in the future will be a good chance for me to play there [in America]," the Portuguese forward said, as per ESPN. "You never know, but it's something interesting. I consider it, of course, because as I've said, soccer there has become better and better... I think that this is maybe going to be possible."

In recent weeks, Cristiano Ronaldo's future has been the subject of almost daily speculation. However, he had previously said that he would be happy to end his career at Real Madrid.