Actress Lily Collins' new book has a very special fan in former first lady Michelle Obama.

The actress-turned-author, 28, took to Instagram where she explained that after sending her book to Michelle on a whim, the former first lady recently sent back a sweet thank you note.

“Best way to start off my week! I can't believe this letter I received from someone I deeply respect and admire. It's absolutely epic. I'm in complete shock but just had to share!” Collins wrote, captioning a video of her reaction.

Collins read the note before revealing it had been written by the former FLOTUS.

The “To the Bone” actress was particularly excited that the letter's envelope included a Wonder Woman stamp.

Addressed “Dear Lily,” Michelle wrote, “I am writing to thank you for the copy of your new book. The gift was such a nice gesture and I look forward to sharing it with my daughters.”

She added, “The outpouring of support I have received from women across the country continues to amaze me, and I am filled with a great sense of hope for our shared future.”

In her collection of personal essays, 'Unfiltered: No Shame, No Regrets, Just Me,' Collins opens up about coping with troubled boyfriends, eating disorders, and her absentee father, musician Phil Collins.