Former first lady Michelle Obama Michelle LeVaughn Robinson ObamaNational Urban League, BET launch National Black Voter Day The Hill's Morning Report - Sponsored by The Air Line Pilots Association - White House moves closer to Pelosi on virus relief bill The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE marked her birthday Wednesday by posting a photo of flowers she received from former President Obama.

"Thank you @BarackObama for the beautiful flowers waiting for me in the office this morning," she said in a caption on Instagram.

"You’re my best friend, biggest fan, and getting notes and flowers from you will never get old."

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The former first lady also extended her gratitude to people around the country who sent her cards and posted on social media for her birthday.

"And to the many people from around the country who sent cards and posted on social media, you have no idea how much we love hearing from you," she said.

"I know birthdays can sometimes be bittersweet (54!), but your messages of hope, generosity, and warmth have always reminded me how lucky and blessed we are," she wrote.

Michelle Obama turned 54 on Wednesday.

Former President Obama also posted on Instagram to wish Michelle Obama a happy birthday, calling her his "best friend" and commending her for her strength, grace and determination.