Nico digs at Hamilton's celeb lifestyle

LONDON, England - German Nico Rosberg is charging out of the northern summer break determined to fire everything at his Mercedes team mate Lewis Hamilton.

Reigning champion Hamilton, leading the duo's in-house 2015 battle by 21 points, entered the August 2015 shutdown period with a notably bad outing in Hungary.

CELEBRITY 'HOBNOBBIN'

The gossip media then followed Hamilton's every step through August, including shirtless, cigar-smoking jaunts with the pop star Rihanna, and mingling with celebrities including Jack Nicholson, Jamie Foxx and Bon Jovi.

Read: Wrong gear skids Lewis from Royal Box

Hamilton posted a picture on his Instagram account posing next to Bon Jovi:

Hanging with the legendary Jon Bon Jovi!! Awesome night!

A photo posted by Lewis Hamilton (@lewishamilton) on Aug 16, 2015 at 5:45am PDT

HAMILTON NOT LOSING FOCUS

Boss Toto Wolff insisted he does not think Hamilton is losing focus on F1.

"In these holiday weeks," Wolff told La Gazzetta dello Sport earlier in August, "everyone has the right to be left alone."

In contrast, however, Rosberg has spent his downtime at home with his heavily pregnant wife.

A photo posted by Nico Rosberg (@nicorosbergofficial) on Aug 8, 2015 at 11:08pm PDT

And the German is bursting back into action for this weekend's (August 22-23) Belgian grand prix with some comments that might be interpreted as a psychological jab at Hamilton's lifestyle.

Rosberg told Germany's Auto Bild: "Your private life does have an impact, you need to be in balance and go to the race weekend with a clear mind. I read about it from time to time. It is mainly about finding your own way to concentrate.

"It is important in sport that you do not have too much other nonsense in your head."