It's a boy! The Big Bang Theory's Johnny Galecki, 44 and girlfriend Alaina Meyer, 21, kiss while covered in blue paint at gender reveal party

Johnny Galecki and girlfriend Alaina Meyer are having a boy.

The 44-year-old actor and the 21-year-old expectant mom threw an outdoor gender reveal party on Sunday with blue and pink decorated treats and a ton of blue paint. 

'To all those who voted boy you were right!' Meyer captioned an Instagram story of her and Galecki covered in paint snuggling up on an outdoor sofa.

It's a boy! Johnny Galecki and girlfriend Alaina Meyer threw a gender reveal party on Sunday

It's a boy! Johnny Galecki and girlfriend Alaina Meyer threw a gender reveal party on Sunday 

'A day I'll never forget,' Galecki wrote alongside a photo of himself kissing his pregnant girlfriend after the reveal.

The couple wore overalls, Meyer in white and the Big Bang Theory star wearing navy.

Earlier this month the actor said he was hoping for a girl.

During an appearance on The Talk Galecki had a couple of his nails painted pink and admitted to the hosts he was hoping for a girl.

'I get a little bored looking exactly the same for nine and a half months every year playing Leonard, so we wrapped and I put some blue in my hair,' he said.

'A day I'll never forget,' Galecki wrote alongside a photo of himself kissing his pregnant girlfriend after the reveal

'A day I'll never forget,' Galecki wrote alongside a photo of himself kissing his pregnant girlfriend after the reveal

Celebrate: The outdoor bash had sweet and savory treats on offer for guests
Celebrate: The outdoor bash had sweet and savory treats on offer for guests

Celebrate: The outdoor bash had sweet and savory treats on offer for guests

Alaina shared a snap of the pretty decorations including floral display and dozens of balloons

Alaina shared a snap of the pretty decorations including floral display and dozens of balloons

What a spread: The hosts also offered pink and blue lemonade as well as some healthy snacks
What a spread: The hosts also offered pink and blue lemonade as well as some healthy snacks

What a spread: The hosts also offered pink and blue lemonade as well as some healthy snacks

Hoping for pink: The 44-year-old actor revealed his hopes for a girl earlier this month as he showed off pink nail polish during an appearance on The Talk

Hoping for pink: The 44-year-old actor revealed his hopes for a girl earlier this month as he showed off pink nail polish during an appearance on The Talk 

'Then I got superstitious that I was like manifesting a boy... when I kinda prefer a girl... don't play this tape for my child years from now... so I painted my nails pink to kinda even out the energy there,' he said.

Galecki played Leonard Hofstadter on CBS' The Big Bang Theory, which wrapped up its 12-season on May 16. 

The couple announced the big news on Instagram on May 3, writing: 'We are absolutely over the moon to announce that we will soon be welcoming a little one into this crazy and wonderful world.

'We ask that you please respect our privacy during this celebratory time for us and our families. There truly is love out there for all. We hope ours is the ember of yours, as we feel yours is the ember of ours.' 

Loved up: Johnny and Alaina only went public with their romance on social media in September

Loved up: Johnny and Alaina only went public with their romance on social media in September

The ecstatic message was accompanied by two photos of the parents-to-be, including one of Johnny and Alaina sharing an embrace on the beach. 

Johnny and Alaina only went public with their romance on social media in September, and two months later made their red carpet debut in November at the E! People's Choice Awards

Since debuting their romance, the May-December couple have not shied away from posting loved-up snaps onto their Instagram accounts.  

Johnny previously dated his Big Bang Theory co-star Kaley Cuoco. 

Big news: Galecki announced the big news via Instagram on May 3

Big news: Galecki announced the big news via Instagram on May 3

Parents-to-be: The couple accompanied their announcement with a photo of them sharing a hug on the beach

Parents-to-be: The couple accompanied their announcement with a photo of them sharing a hug on the beach

Beach babes: Galecki and his girlfriend soaked up the sun in snaps posted online back in December

Beach babes: Galecki and his girlfriend soaked up the sun in snaps posted online back in December 

Not only did the couple date for two years, but they also played each other's love interests on the comedy show.    

The pair split up in 2009 and Kaley went on to marry pro tennis player Ryan Sweeting in December 2013.

Following the end of her marriage to Sweeting, the actress, 33, went on to tie the knot for a second time with equestrian Karl Cook this past June.

Johnny also dated his Roseanne co-star Sara Gilbert while starring on the show in the 1990s.   

Loved up: Meyer cosied up to her beau in a snuggly snap posted to Instagram

Loved up: Meyer cosied up to her beau in a snuggly snap posted to Instagram 

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Johnny Galecki and girlfriend Alaina Meyer reveal they are having a boy

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