Serena Williams posted a romantic photo of Rome at night on her Twitter account, adding that she and another person "stopped to take pics," leaving many fans wondering if she was on a date with her coach and rumored boyfriend Patrick Mouratoglou.

Two weeks ago, posted on Twitter that she spent her night in bed with no invite to Sasha Bajin's house for a "pre Williams invitation event."

Is the Australian Open star, who is rumored to be dating coach and rumored boyfriend Patrick Mouratoglou, lonely?

Serena Williams has been active on Twitter posting about her entrepreneurial and athletic successes, but she seems to be avoiding mentioning her boyfriend Patrick Mouratoglou.

The Australian Open star has, however, posted about her rival Maria Sharapova.

She mentioned earlier on that she liked Maria Sharapova's outfit on Twitter.

"I'm loving Maria S Nike outfit. #approved #supercute," the Australian Open star wrote.

Two weeks ago, she posted messages saying she spend the weekend at Zales and was watching the Bridezillas television show on Twitter.

"Another weekend... Spent at Zales this time I brought Venus," she wrote in one piece.

"Is it weird that I'm watching bridezilla all day???"