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What a gorgeous pair!

Paris Hilton and beau River Viiperi hit the red carpet at Avalon in Hollywood for Will.I.Am's annual TRANS4M concert benefitting I.Am.Angel Foundation.

We're lovin' Princess P's neutral colored ensemble ... especially the Louboutins!

Also hitting the party ... Real Housewives of Beverly Hills' star Adrienne Maloof and her much-younger boytoy Sean Stewart. Yowza!

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See who else partied with Will.i.am in our gallery below.