The fashion designer shared the happy news with a sweet snap on Instagram.
The designer has created iconic looks for celebs like Rihanna, Katie Holmes and Sarah Jessica Parker for the past 18 years.
From Oprah Winfrey to Natalie Portman and Miley Cyrus, ET's taking a look back at Zac Posen's most memorable red carpet moments.
The designer announced the news via Instagram on Friday.
ET spoke with the fashion designer about his longtime pal, Katie Holmes, at Vanity Fair's Best Dressed List party in New York City.
Holmes and Foxx reportedly called it quits last month, after six years of dating.
Everyone from Willy Wonka to Shrek was in attendance!
The actress and designer have a longtime friendship and frequently collaborate.
From intimate looks into pop stars' lives to powerful explorations of racial injustice, there's something to satisfy everyone's non-fiction cravings.
In conversation with ET, the designer reflects on the darker times in his career and praises 'Project Runway’s decision to feature models of all sizes.