Heidi Klum is at it again, posting racy vacation pics that bare plenty of skin. This time, it's a topless photo of Klum on the beach in Bora Bora.

The former supermodel and host of "Project Runway" shows off her tanned and toned physique as she stands on her tiptoes hugging a palm tree on a sandy beach.

Klum has a history of posting sexy photos on social media. Her Twitter and Instagram accounts are full of nearly nude pics and cheeky poses. Scroll down for a selection of some of her best snapshots.

Klum is now 40, but she sure doesn't look it. She spent 13 years as a model for Victoria's Secret before parting ways in 2010. Since then, she's focused on building her business brand and her hosting duties on "Project Runway," where she serves as the arbiter of all things fashionable, alternately deriding and praising the work of aspiring fashion designers scrambling to win her accolades.

Klum's seven-year marriage to the singer Seal ended in 2012. They have four children together, three biological and one adopted from Klum's previous relationship with Flavio Briatore.

Currently, Klum is dating her bodyguard Martin Kristen, who is often seen escorting her and her children on outings about town or on vacation. Check out her other photos below and let us know what you think.