Washington, May 4 -- Gigi Hadid has taken to Instagram to make her relationship with Bradley Cooper official on social media.

The supermodel shared a photo of the two kissing at her 30th birthday party, along with a heartfelt caption expressing her gratitude for life, love, and support.

"I feel so lucky to be 30! I feel so lucky for every high and low- for all the lessons and gifts both have brought me. To get to feel it all! I'm so lucky to be a mom, friend, partner, sister, daughter, colleague to some of the most unbelievable humans!!" she wrote.

"So lucky for the support and encouragement from all of YOU around the world, every day and on my birthday last week. I had the best time celebrating, and it's a blessing to feel so loved!! ...