Final answer:
In 'The Office' S6E12 'Secret Santa', Andy Bernard is the one who gave Erin the gifts from 'The 12 Days of Christmas'.
Step-by-step explanation:
The question refers to an episode from the television show The Office. In Season 6, Episode 12, titled "Secret Santa", the character Andy Bernard gave Erin the gifts from the song "The 12 Days of Christmas" as part of the office's Secret Santa gift exchange.
This action resulted in some humorous and unintended consequences, as real birds and other gifts from the song created chaos in the office.