Japanese industrial and design companies teamed with her record label to create the Gagadoll, inspired by her new "Artpop" album. They're prototypes not yet available for sale.
At the news conference, the 27-year-old singer made her grand entrance wearing a red plaid jumpsuit and wrapped in coils of the same fabric.
Gaga is participating in a charity auction to benefit the 2011 earthquake and tsunami victims. She's hoping that one of the two Gaga-styled Hello Kitty dolls will raise a lot of money for the cause.
"Artpop" hasn't matched the critical acclaim or sales of her blockbuster "Born This Way" album.
Gaga said she looked forward to returning to Japan with the "Artpop" tour. The concert schedule hasn't been released.