Kesha Shouts Out VP Joe Biden ... and Lady Gaga

Kesha's not fully unplugged during her Caribbean vacay -- she tuned in for the Oscars and used the buzz around Lady Gaga to put a spotlight on her sexual assault allegations against Dr. Luke.

Last night she thanked Gaga and Vice Prez Joe Biden for "bringing attention to sexual assault at the Oscars."

As we've reported, Kesha jetted to Turks & Caicos over the weekend to escape her legal problems, but she was obviously watching when Biden intro'd Gaga's performance of "Til It Happens to You."

Kesha's review -- "It hit very close to my heart for obvious reasons."