(Cover) - EN Showbiz - George Clooneys girlfriend is planning the party of the century to celebrate his 50th birthday.

The Hollywood hunk hits the landmark age on May 6 and Elisabetta Canalis is determined to make it the best birthday he has ever had. She has already started organising the bash as she wants to make it perfect, and ensure all Georges friends can be there to help him celebrate.

Elisabetta has her own money, and shes paying for the party of the century, a source told In Touch Weekly. She really wants this to be the best night of Georges life.

Among the guests who have already been invited are Brad Pitt and his partner Angelina Jolie, Julia Roberts, Matt Damon and Ben Affleck. Many others stars are also expected to attend.

At the moment it is unknown whether Elisabetta wants the party to be themed, although it is believed she wants it to be a lavish affair.

The actor and Italian TV presenter began dating in 2009, and are very happy together. They get on well, with Elisabetta admitting George sometimes has to reassure her about their relationship.

Since they began dating there have been almost constant rumours the pair are planning to tie the knot or have kids Elisabetta recently insisted they will never start a family which the female star finds tough.

There are some people who just don't want to see me happy. It might seem a clich, but unfortunately it is true: the Italians never support their own citizens who earn an opportunity or recognition abroad, she said. I sometimes feel insecure, but if you are loved then you always feel great. [George] reassures me all the time. He is very close. I feel more embraced than ever before. (C) Cover Media