parisjoshfergieredcross.jpgParis Hilton STUNNED in a low-cut dress while Fergie chose to tone it down in a surprisingly tame knee-length red dress at the Red Cross' Red Tie Affair in Santa Monica last night.

Paris, who brought along her beau Cy Waits, tweeted "So nice seeing Fergie and @JoshDuhamel at The Red Cross Event tonight. They are such a sweet and beautiful couple."

But the party wasn't over for Paris and pals after the event. She had a "romantic dinner" with her man at BOA before meeting up with sister Nicky at Beacher's Madhouse in Hollywood.

Also attending the event that honored is honoring Betty White, Josh Duhamel and a team of doctors and medical specialists from Saint John's Health Center in Santa Monica was a solo Pete Wentz. Did he tame his mane for this red carpet event?

Check it out ... after the jump.