Tallulah Willis shaves head, channels mom Demi Moore in 'G.I. Jane'

Like mother, like daughter!

Bruce Willis and Demi Moore's 20-year-old daughter Tallulah Willis shaved her head, revealing just how much she looks like her famous mother. Instagramming her new look on Tuesday, she wrote: "November 18th. remember it."

Tallulah then posted a pic of her Moore in 1997 when she shaved her head for the military drama G.I. Jane. She captioned the photo: "mawms is bae. #thankgodgoodheadshapesruninthefamily."

The Hollywood heir then took her new hairless head to L.A.'s Sayer's Club to support her 26-year-old sister Rumer Willis' music. She wrote: "Luv u proud of u can't wait to hear you sing my precious songbird @ruelarue."

PHOTOS: Two Looks, One Star

Rumer supported her sister, Instagramming: "@buuski is a bad ass bitch #GIjane #rawbeauty."

The youngest Willis sister, Scout, posted a Vine video of Tallulah singing long to Sinead O'Connor's hit "Nothing Compares 2 U." The 24-year-old cleverly captioned the video: "Sinead O'@buuski."

Tallulah also tweeted a selfie of her style, writing: "First nite out as a bald eagle vibe."

This isn't the first big reveal for Tallulah this year. In August, she debuted her major weight loss, confessing that she suffered from body dysmorphia. "I was trapped in this body," she explained in a video for StyleLikeU. "I started starving myself and losing a bunch of weight and I got down to like 95 pounds. When I lost my curves and when my boobs shriveled up into like nothing and I had no shape, it put me in even more of a cage."

WATCH: Four4Four: Will Bill Cosby ever work again?