Sato, who promised to learn English for her next interview with the "Suit and Tie" singer, seemed nervous and excited to be in the same room as Timberlake throughout the interview.
After stuttering over a question about whether he feels like he's the new Michael Jackson and being turned down when she offered to to teach him how to dance samba, Sato concluded the interview by handing Timberlake a prosthetic version of her behind.
"Oh my god. This is your butt!" Timberlake said as he stared at the autographed prosthetics. "[It says] with love. That's very nice."
Sato later explained that the butt was for Timberlake to play, as he would bongos.
In other Justin Timberlake news, the 32-year-old singer released the first single of his upcoming album "The 20/20 Experience 2 of 2" on Friday and it is titled, "TKO."
2014: The Year in Music [PHOTOS]