Reese Witherspoon proudly danced to her 16-year-old son Deacon Phillippe’s first single much to his embarrassment.

“When your kid has his first single... you gotta dance!” Witherspoon captioned a clip on Saturday.

In the video, Phillippe played his new song, “Long Run” while sitting on a couch with the “Legally Blonde” star.

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Witherspoon started to dance and then abruptly said, “Deacon, I should make a TikTok dance to this song!”

“Oh, God. No, mom. No,” the teen responded. Regardless, his mom kept grooving!

Phillippe was still thankful for his mom’s support. “Hahahahah I love you,” he commented on the post.

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Gwyneth Paltrow commented: “We mortify them, but it’s from pure love! Way to go Deacon!”

Witherspoon’s “Cruel Intentions” co-star Selma Blair said, “Makes me smile so broadly. Congratulations!”

“Great song and DANCE,” Octavia Spencer said.

Phillippe featured singer Nina Nesbitt on his new single. “Omg I need to see this dance 🙈💞🤣,” she commented on Witherspoon’s post.

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The “Little Fires Everywhere” actress excitedly shared on Friday that her son’s song was available across streaming platforms.

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“New Song of the Summer! #LongRun So proud of my son @deaconphillippe... his first single with the incredibly talented @ninanesbitt is out now!” Witherspoon wrote on Instagram. “It’s the perfect summer bop with a sick beat and dope drops (is that what the kids say 🤗?!)”