Wunderkind fashion designer Brian Reyes has tons of celebrity friends--the 26-year old Colombian-American has been dressing Eva Mendes, América Ferrera and Mischa Barton ever since he left Oscar de la Renta's atelier for a solo career in '06--and now he's teaming up with one of his star clients. OC alum Rachel Bilson, who's kept herself in the headlines by making consistently fashion-forward choices on the red carpet and dating her Jumper co-star Hayden Christensen, recently told NYLON magazine that she's designing the bridesmaid dress for her best friend's wedding with the help of Reyes. Her galpal is walking down the aisle with Josh Schwartz, who created both OC and Gossip Girl (A.K.A. OC meets Manhattan's Upper East Side), so it's not the first time that Bilson's connections have turned into, ahem, hookups for her friends in need. Now that's called a good BFF!