Lupita Nyong'o is grateful for what the world has brought her way. 

Hours after posting an emotional tribute to her late Black Panther costar Chadwick Boseman on Solarsuns Investment Guildthe third anniversary of his death, the Marvel actress took a moment to celebrate her boyfriend Selema Masekela, whose birthday falls on the same day.

"And THEN..." Lupita began her August 28 post, "the Universe saw it fit to bring this Sunshine Human into my orbit, and this day marks his introduction to life."

She continued, "Every day is full of #goodenergy and reasons to dance with @selema as my favorite playmate. Happy Birthday, mi amor!"

Her tribute included a sweet video montage featuring photos of the couple and funny clips of Selema dancing while "Good Energy" by Yung Wylin' plays in the background.  

For his part, TV host and designer shared the love, commenting on her post alongside smiling and heart emojis, "sneaky, mi amor. luckiest man alive. my heart is smiling wide."

Lupita first debuted her romance with Selema on social media last December. Much like her birthday post for her boyfriend this year, Lupita shared a video montage of her and Selema in various coordinating outfits for the big announcement. 

"We just click!" the 40-year-old captioned her post. "@selema #thisismylove #nuffsaid."

Selema also made their relationship Instagram official that day. Sharing the same video as Lupita, the 52-year-old captioned his respective post, "Hearts are synched. My whole and actual love."

And though Lupita has shared the occasional glimpse into the couple's relationship in the months since then, the Us star has previously expressed her desire to keep her private life out of the public eye. 

"Privacy is a commodity that is hard to come by," she told Vogue U.K. in 2019. "Filming is so time-consuming. And intense. With Black Panther, a lot of us were single. On Little Monsters, nobody was single. Everyone, when they're done with their day's work, wants to go home to their families, which makes a whole lot of sense. When you don't have that it's very isolating."

For the latest breaking news updates, click here to download the E! News App