Julia Roberts took to Instagram to send well wishes to her niece Emma Roberts in honor of her 31st birthday on Thursday. 

The Pretty Woman star, 54, uploaded a funny slow motion video of the twosome, who not only share the same acting profession and looks, but apparently also the same sense of humor.

'Happy Birthday Magical One!. Oh how I love you,' wrote Roberts, who encouraged her followers to sit through the entire clip for the comedic payoff with the hashtag '#waitforit.'

Happy Birthday! Julia Roberts took to Instagram to send well wishes to her niece Emma Roberts in honor of her 31st birthday on Thursday 

Roberts, who turned 31-years-old on Thursday, February 10, can be seen wearing matching party hats with her look-alike aunt as they stare directly into the camera.

Setting the mood, both leading ladies are standing still with party blowers in their mouths, and cold, stoic looks on their faces.

Just when you think, something's going to happen, viewers will have to wait even longer.

Hilarious: The Pretty Woman star, 54, uploaded a funny slow motion video of the twosome, who not only share the same acting profession and looks, but apparently also the same sense of humor 

Playful: The video begins with Emma wearing matching party hats with her look-alike aunt as they stare directly into the camera with stoic faces

Game face: The Roberts ladies keep their stoic faces even after their party blowers shoot out

Eventually, the payoff for the celebratory video comes when they blow out their party blowers, complete with the original audio.  

And then, just as each of the party favors shoot back into their original place, a mysterious hand comes into view and throws confetti into the air.

It's at this point that Julia becomes the first of the two to break their stoic game faces to flash one of her legendary beaming smiles. 

Emma quickly follows suit and cracks a smile of her own, which along with her beauty, is also reminiscent of her Aunt Julia.

The post appears to be a throwback video, although it's not exactly known what celebration it was show at in the recent past.

Party favors: The payoff for the celebratory video comes when the party favors shoot back into their original place and a mysterious hand comes into view and throws confetti into the air

Keeping that game face: Both ladies keep a straight face as the confetti fell

Infectious: Eventually, Julia broke her stoic face and flashed her legendary beaming smile

Glowing: The video clips ends with Emma and Julia both smiling at the same time

Emma's mother, actress Kelly Cunningham, also took to Instagram and shared a series of photos of herself and her daughter taken over the years.

'Happy birthday my love and my force to be reckoned with. You were always up for a challenge and adventure,' she gushed over Emma in the caption of one throwback snap.

Another image shows Emma mimicking her Aunt Julia in her iconic celebratory pose just as she won the Best Actress Oscar in 2001 for her role in the acclaimed biopic Erin Brockovich.

Prousdmama: Emma's mother, actress Kelly Cunningham, also took to Instagram and shared a series of photos of the mother and daughter taken over the years

Look-alike: Her other's post also shows Emma mimicking her Aunt Julia just as she won the Best Actress Oscar in 2001 for her role in the acclaimed biopic Erin Brockovich

Family bouquet: Emma mom also shared a picture of the bouquet of flowers that she seemingly sent, along with Emma's sister Grace, and her one-year-old son Rhodes, whom she shares with ex-Garrett Hedlund, whom she split from last month

There's also a throwback snap of Cunningham sharing a special moment on the beach with Emma when she was a young girl.

And finally, the proud mother posted a picture of the bouquet of flowers that she seemingly sent, along with Emma's sister Grace, and her one-year-old son Rhodes, whom she shares with ex-Garrett Hedlund, whom she split from last month. 

Feeling all the love, Emma, who's dad is Pope Of Greenwich Village actor Eric Roberts, shared a photo of herself while out in nature in a one-piece swimsuit. 

'Thank you for the birthday wishes. Feeling very grateful and loved! #31,' she wrote in the caption.

Throwback: There's also a throwback snap of Cunningham sharing a special moment on the beach with Emma when she was a young girl

Bday wishes: Cunningham wrote, 'HB my love,' alongside a photo of Emma as a toddler

Giving thanks: Emma thanked everyone for the birthday wishes with a photo of herself soaking in  some of Mother Nature's wonders, while dressed in a one-piece swimsuit