World No. 1 Novak Djokovic crushed Rafael Nadal at the Australian Open at Rod Laver Arena Sunday night while his long time girlfriend Jelena Ristic was cheering him on from the stands.

According to reports, the five-time Grand Slam champion has been dating Ristic since the end of the 2006 session. The Serbian tennis star said that he and Ristic had been together for six or seven years and had lots of support and understanding between each other.

Djokovic recently posted a fat picture of his girlfriend on his Twitter account that gained much media attention last week.

After winning the Australian Open fourth round match when Djokovic was motivated to talk about Ristic, he revealed that he had taken pre-match pictures of Ristic on his cell phone and with the help of an application he added a few hundred pounds to her face. It was funny to watch Ristic's photo in his mobile, he said.

According to Djokovic, Ristic is always encouraging him every time and he is thankful to her for traveling along him on ATP Tour.

Here are some little known facts about Novak Djokovic's stunning better half.

- In the year 2008 in Shanghai, Djokovic reportedly referred to Ristic as Miss Universe. She's a Miss Universe of 2006, Djokovic told the press during the Tennis Masters Cup. The statement erupted rumors that Djokovic was indeed dating a Miss Universe, a title that Ristic never held.

However, Djokovic later clarified that he merely meant the term in jest.

- Reports said Djokovic is likely to marry Ristic soon in 2012 in front of family and close friends in his home town Monaco in Serbia. The wedding ceremony will takes place in a traditional church.

- Ristic is said to have studied finance at Bocconi University in Milan, Italy and is currently working in Tamoil in Monaco.

- Ristic is said to be fluent in 17 languages, including Italian and English.

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