Nico Rosberg has had a cheeky dig at team-mat✱e Lewis Hamilton after the double world champion turned 30 on Wednesday.

Hamilton's Mercedes team had bee🗹n encouraging Twitter users to send in their wishes on his birthday with the hashtag #HappyBirthdayLewis. Rosberg - who is six months younger than Hamilton - then sent his own tweet which jokingly mocked Hamilton's age, saying "hopefully it will be easier for me this year" ahead of 🌟the 2015 season.

- 30!! Have a great party! This day is good for me. You are old now, so hopefully it will be easier for me this year :-)-- Nico Rosberg (@nico_rosberg)

Rosberg and Hamilton had a difficult relationship as t🗹eam-mates fighting for the drivers' championship last season, which culminated in the two colliding at Spa before Hamilton took the title at the last race of the💜 season in Abu Dhabi.