We had no idea the actor was friends with Mother Monster!

Lady Gaga hosted an intimate dinner at Gjelina in Venice Beach for her 31st birthday last night, and famous pals like Johnny Depp and Elton John were on hand to watch her blow out the candles on her cake. We couldn't help but notice how gaunt and frail the Pirates of the Caribbean star appeared, and we have a feeling the stress of his divorce from Amber Heard has really taken its toll.

The "Million Reasons" songstress decided to go brunette to mark another year around the sun, and she couldn't help but thank her fans for their support on her special day.

"I don't know how to thank my fans enough for the love you have shown me over the years and always on my birthday. Today I have focused on smiling about all that I'm grateful for and reflecting on the last ten years of music and performances we have shared together. Thank you for continuing to inspire me to mold my fantasies into reality. Embrace your differences, celebrate who you are, it's in the unique parts of you that greatness hides. Don't be afraid to find it. Thank you for the Birthday Wishes. I ❤You," she captioned a selfie from the car.

She draws quite the eclectic group!

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