Hollywood star Colin Farrell is preparing for his next big role - best man at his brother's gay wedding.

The actor will stand beside his sibling Eamonn when he marries longterm partner Steven Mannion in Provincetown, Massachusetts this spring (08).

Farrell is close to his brother and helped chose Mannion's diamond and sapphire engagement ring, when Eamonn proposed last year (07).

A family friend tells the National Enquirer, "Colin is a firm believer in gay rights and he is proud of his brother.

"He took Eamonn shopping for rings and intends to pick up the tab for the wedding." (IG/NE/KL)

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