Reese Witherspoon says her 'heart is bursting with pride' as she wishes son Deacon Phillippe a happy 18th birthday

Reese Witherspoon has wished son Deacon Phillippe a happy 18th birthday.

The Legally Blonde actress took to Instagram to share a sweet set of photos of her young man.

In her caption the actress/producer, 45, wondered: ' How did this happen?!! @deaconphillippe is 18?!!'

All grown up! Reese Witherspoon wished son Deacon Phillippe a very happy 18th birthday on Saturday

All grown up! Reese Witherspoon wished son Deacon Phillippe a very happy 18th birthday on Saturday

'One day he was trading Pokémon cards, singing Bruno Mars songs, and playing American Ninja Warrior in the backyard.'

'The next day, he is taller than me, cooking the family steaks on the grill and making his own music with his best friends,' she went on of her eldest son, who she shares with ex-husband Ryan Phillippe.

'My heart is bursting with pride about the young man he is becoming. 

'Happy 18th Birthday Deacon! I love you to the moon around the sun and all the stars.'

Grown up: 'One day he was trading Pokémon cards, singing Bruno Mars songs, and playing American Ninja Warrior in the backyard. The next day, he is taller than me,' she wrote

Grown up: 'One day he was trading Pokémon cards, singing Bruno Mars songs, and playing American Ninja Warrior in the backyard. The next day, he is taller than me,' she wrote

Back then: He cuddled up to mom and enjoyed a drink in a throwback

Back then: He cuddled up to mom and enjoyed a drink in a throwback

The handsome musician held a pup in one snap while he cuddled up to mom and enjoyed a drink in a throwback. 

Deacon was also snapped blowing out the candles on his birthday cake with his younger brother Tennessee at his side. 

Reese also has a 22-year-old daughter named Ava with Phillippe.

She shares youngest son Tennessee, nine, with Hollywood power player Jim Toth.

Make a wish! Deacon was also snapped blowing out the candles on his birthday cake with his younger brother Tennessee at his side

Make a wish! Deacon was also snapped blowing out the candles on his birthday cake with his younger brother Tennessee at his side

Lots of love: 'Happy 18th Birthday Deacon! I love you to the moon around the sun and all the stars' mom continued

Lots of love: 'Happy 18th Birthday Deacon! I love you to the moon around the sun and all the stars' mom continued

Deacon has been working on his music career, releasing the song Long Run in 2020.

The second generation celeb has said he likes being behind the scenes these days, telling Interview magazine: 'I realized there's more to making music than just being a vocalist, and that a lot of times it's the production that makes me feel something.

'I asked my dad about how it works, and he taught me all the stuff he knew, and then I started watching YouTube videos.' 

Dad: Deacon's dad is Ryan Phillippe. Mom Reese also shares 22-year-old Ava with Phillippe, above

Dad: Deacon's dad is Ryan Phillippe. Mom Reese also shares 22-year-old Ava with Phillippe, above

Reese Witherspoon wishes son Deacon Phillippe a happy 18th birthday

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