Jennifer Aniston and Brad Pitt have sparked the speculation they may get back together after Brad threw a lavish party to celebrate his estranged wife’s 36th birthday.

The sexy Troy star has spent two days preparing the celebration at the couple's Beverly Hills mansion and then stood side-by-side with Jennifer as they welcomed numerous A-list guests, such as Morgan Freeman, Gwen Stefani, Mel Gibson, Cindy Crawford and Arnold Schwarzenegger.

The glamorous couple, who have been together for seven years, announced their separation a month ago but have been seen together since, including an intimate meal at the L'Orangerie restaurant in Hollywood, reports Daily Record.

According to TeenHollywood.com, Pitt has realized the importance of Aniston in his life and is desperate to win her back. "Recently, he's realized more than ever, that Jennifer is his soulmate. They're definitely not letting go of each other just yet,” said a friend.

Brad's grandmother Betty Russell also believes in the couple’s reunification and told Britain's More magazine: "I'm sure this is just a temporary thing. Brad and Jennifer have too much love to throw it all away."