Alicia Silverstone Is Shocked as She Learns Son Bear, 13, Grew Taller Than Her 'Overnight': 'Are You Serious?'

The 'Clueless' star shares her 13-year-old son with ex-husband Christopher Jarecki

<p>Alicia Silverstone/Instagram</p> Alicia Silverstone and son Bear

Alicia Silverstone/Instagram

Alicia Silverstone and son Bear

Alicia Silverstone's little boy isn't so little anymore!

On Thursday, Sept. 19, the Clueless star, 47, shared a cute cooking video with her son Bear, 13, on Instagram. Before cheffing up some vegan quesadillas, the mother-son duo stood face-to-face and back-to-back, discovering that Bear has officially grown taller than Silverstone.

"Are you serious?" the proud mom exclaims, before asking, "Where's your mouth?" Bear then leans forward to show that his mouth is well above his mom's. Silverstone glares at the camera in disbelief.

Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer​​, from celebrity news to compelling human interest stories.

Related: Alicia Silverstone Celebrates Son Bear’s 13th Birthday: ‘It’s Official, My Baby Is Now a Teen!’

Still not convinced that Bear is taller, she orders, "Go back-to-back." Once again, the 13-year-old, who Silverstone shares with ex-husband Christopher Jarecki, is taller than his mom. "This happened overnight. I was taller than you last night," she says to her son.

"I know," Bear chimes in. "Crazy!"

The mother-son duo then cook up vegan quesadillas together. "Chef Bear" goes step-by-step, showing off his cooking techniques from how he seasons his beans to how he chops up cilantro.

The PEOPLE Puzzler crossword is here! How quickly can you solve it? Play now!

<p>Alicia Silverstone/Instagram</p> Alicia Silverstone and son Bear

Alicia Silverstone/Instagram

Alicia Silverstone and son Bear

"Chef Bear is taking over the kitchen for a yummy dish! 🌞" Silverstone wrote in her caption, adding, "It makes my heart so happy to see how much he loves cooking and how good he is at it. And how lucky am I that he feeds me sometimes?!"

She continued to discuss Bear's new height, revealing that since the video was filmed, he has grown to be more than three inches taller than the actress.

"PS: I still can’t get over how tall Bear is!! Where did the time go!? Btw since this video… he is now more than 3 inches taller than me… 🥹😭," she wrote.

For more People news, make sure to sign up for our newsletter!

Read the original article on People.