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H&M launched a secret viral video campaign earlier this week asking fans to guess their next big designer collaboration and many had their money on Bottega Veneta’s Tomas Maier or Carolina Herrera. But today, WWD reports that sources say H&M has tapped celebrity-favorite Lanvin, and the fast-fashion giant is expected to unveil the details September 9th. Cameron Diaz, Chloe Sevigny, Sarah Jessica Parker and Diane Kruger all have Creative Director Alber Elbaz to thank for some seriously chic red carpet moments. Tell us: Would you buy Lanvin for H&M?

UPDATE: It’s official! Lanvin will design both a women and menswear collection for H&M. The designs will be revealed on November 2nd and hit stores November 20th. Watch the adorable Alber discuss the exciting collab in the video after the jump!