updated 01/10/2011 AT 8:05 AM ET
•originally published 01/10/2011 AT 11:55 AM ET
Jeremy Renner has friends in high places – and plenty of them.
Christina Aguilera, Leonardo DiCaprio, Blake Lively and Scarlett Johansson were among the A-list stars who helped the Hurt Locker actor ring in his 40th birthday at his Hollywood Hills home on Saturday – a bash that’s being called special even by Hollywood standards.
“It was one of the better Hollywood parties in a long time,” one source tells PEOPLE. “Jeremy pretty much had a who’s who of the industry come out to celebrate his birthday.”