Michelle Obama, who turned 54 on Wednesday, took to Instagram and shared her thoughts about former President Barack Obama.

Former first lady Michelle Obama on Wednesday shared a picture of the birthday bouquet she received from her husband, and, in a heartwarming Instagram post, called him her "best friend." "Thank you @BarackObama for the beautiful flowers waiting for me in the office this morning. You're my best friend, biggest fan, and getting notes and flowers from you will never get old," she wrote on Instagram. "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." How the former first lady spent January 17, which marks her 54th birthday, is largely unknown, but she did appear to be having a great time in the days leading up to it. A recent photo of her wearing a very stylish bikini, while vacationing in Miami, was posted by an Instagram user earlier in the week.