Michelle Obama, also known as @FLOTUS on social media, sent a birthday tweet to her role model and friend, Beyoncé, this afternoon.

Happy Birthday, @Beyonce! You’re an incredible role model, a phenomenal mother, and a wonderful friend. Hope you have an amazing day! -mo

— The First Lady (@FLOTUS) September 4, 2014

The duo are reportedly ‘BFFs,’ or ‘Bigtime Famous Friends.’

The “Drunk in Love” star sang at President Obama’s first inaugural ball and also serenaded guests at the first lady’s 50th birthday celebration earlier this year. 

“FLOTUS” even took her daughters to a Jay Z concert in July, following a family outing to a fundraiser that benefited the Democratic National Committee in Chicago.

The first family then accompanied Beyoncé, Jay Z, and Blue Ivy to a steakhouse.