This is the moment that Lady Gaga almost knocked out Ellen Degeneres with her bizarre planetary headgear

The wacky singer's appearance on the comedienne's US chat show almost ended in injury when the metallic head brace-like sculpture nearly knocked over the host as she tried to give her guest a hug.

Poker Face starGaga – who often dresses as if she's from another planet – joked of her latest accessory: "It's an orbit. It's a barrier. It's my Gaga barrier."