Cristiano Ronaldo has posed for selfies with a Victoria's Secret model on the set of their new "secret project".

Cristiano Ronaldo

Cristiano Ronaldo

On Friday, the Portuguese international posted a video on Twitter, announcing that it was "great" to meet Brazilian model Alessandra Ambrosio as they worked together on a "special project".

In the video, Ronaldo says: "'Hi guys, we've finished photo-shooting, it was amazing filming with Alessandra, she is fantastic, she do a fantastic job.

"We not going to say for what we did because it's a secret, we hope you going to like it."

Alessandra tells the Real Madrid forward that she had a "great time" with him, and calls him "an amazing person, super-nice guy".

Ronaldo broke up with Russian supermodel Irina Shayk at the beginning of the year, but Ms Ambrosio, who is married with two children, is likely only interested in a professional relationship.

The football star has opened up great possibilities for collaboration on various projects after expanding his CR7 fashion range and modelling for names such as Armani in recent years.

The two Portuguese-speaking collaborators seem set on maintaining the mystery surrounding their project for now, saying fans will "soon" find out what it is.

"It's a top secret project so you're not going to find out," said Ms Ambrosio.

On Saturday, Ronaldo will be focusing on football once again, as he tries to guarantee his position as Los Blancos all-time goalscorer by scoring against Levante.

Watch Ronaldo's video here.