Rachel McAdams Cut Her Hair; Raquel Zimmermann Lands Viktor & Rolf Campaign

Rachel McAdams.

• Rachel McAdams premiered her new short bob at Comic-Con in San Diego over the weekend. [Beauty Counter/Style.com]

• Jennifer Lopez combined two updos for her 40th-birthday-party look on Saturday — the front looked like braids, but the back was a French twist. Fancy. [Beauty Department/Glamour]

• Tone-on-tone color is going to be a big hair trend this fall, according to Jason Backe, president and CEO of Ted Gibson and a Clairol Color Director. "The variation will be a bit bolder in the size of the ribbons or highlights but the tones will be subtle," he said. [Beauty 411]

Raquel Zimmermann stars in the Viktor & Rolf campaign for the label's new fragrance, Eau Mega. [Design Scene]

Tyra Banks went to the Dashing Diva salon at 16th Street and Third Avenue to get her nails done recently. [Glam Blush/Glam]