Outgoing Formula 1 world champion Nico Rosberg has congratulated former Mercedes teammate and 🐽rival Lewis Hamilton on his fourth title win in Mexico on Sunday, say it was "well-deserved".

Rosberg retired after beating Hamilton to the F1 title at the end of the 2016 season in Abu Dhabi, and has since been a ꧋keen🍰 observer of his ex-teammate's fight with Ferrari's Sebastian Vettel while pursuing interests outside of the sport.

Hamilton clinched his fourth F1 world title by finishing ninth in Sunday's 🦋Mexican Grand Prix, wi🍌th Rosberg sending his congratulations and reflecting on the season as a whole in a vlog on his YouTube channel.

"To begin with, Lewis, congrats. A really awesome perfo⛎rmance this year and a really well-deserved fourth championship, very, very impr🏅essive of course," Rosberg said.

"I hope you all enjoyed the race today, I definitely did. What a season it has been also overall. The battle, Mercedes and Ferrari with Red Bull in the mix, perfect I think, and also then Lewis versus Seb ha💧s been exciting, and everyone else came in the mix from time to time.

"And then, of course, a big congrats to Mercedes because really incredible job what you've done across this massive regulation change having to completely start from scr🌃atch and then to again dominate like that, especially now towards the end of the season, I think that's very, very impressive."