Alicia Silverstone's son Bear looks all grown up as he turns 15

Alicia Silverstone is celebrating her son Bear's another trip around the sun.

​The Clueless star took to her Instagram account on Wednesday and marked her son Bear's 15th birthday with a touching note.

​In the celebratory post, the proud mom posted a series of throwback pictures of Bear and also his recent ones.

​While expressing her disbelief at how fast time flies, the actress wrote in the caption, "It’s Bear’s birthday today 15 years with this human… I can’t believe it.."

​She went on to gush, "Being his mom has been the most incredible gift. I love my Bear so much. I’m so proud of who he is…"

​"And I’m the luckiest mama," Alicia concluded.

​The carousel began with a wholesome picture of Alicia, as a newly minted mom, hugging Bear when he was a newborn baby.

​In other slides, he can be seen climbing a tree, playing with his dad Christopher Jarecki, doing yoga, sitting on the cockpit of an aircraft, and driving a jeep without a roof while he sits on Alicia's lap.

Bears looked all grown up in two snaps included in the slide, in one he took a selfie with his mom while donning a red T shirt the other one showed the mother-son duo enjoying a day out at waterfall place.

​It is pertinent to mention that Alicia shares her only son, Bear, with her ex husband Christopher Jarecki.