The font used for "ADELE 21" is one of the most requested fonts in the forums at dafont.

RELEASE NOTES:

• 1/24:
  - Fixed a character flaw.
  - Made the "O" and "0" more unique.
  - Ligature fixes.
  - Quality increase.
  - Given a proper name.
  - @font-face web font kit.

The web font was generated by Font Squirrel and is only 95kb in size. I have tested it on my tumblr custom theme, it works for me. User responsible for web/file hosting.