'Simple' Drake holds low-key restaurant opening celebrations with Serena

Looks like Drake is one of those who likes to keep his celebrations simple as he kept his new Restaurant opening party mellow with his rumored girlfriend Serena Williams, who was the only important guest.

The 33-year-old Tennis player, who wore a white skirt and denim top, was spotted at the rapper's party, E! Online reports.

The 28-year-old rapper shared number of pictures from his party, one of the pics showed him embracing his mother Sandi Graham, who was also there to support his son.

Drake has opened his new restaurant Fring in Toronto and has collaborated with local chef Susur Lee.