Gwen Stefani shares sweet video of Blake Shelton embracing her son on his 14th birthday

Gwen Stefani's first baby is all grown up.

The "Hollaback Girl" singer, 50, paid tribute to her eldest son, Kingston, on his 14th birthday on Tuesday.

She shared a photo of Kingston at the beach, captioning it, "happy 14th bday to my first born son -thank u God for making me HIS MAMMA GX #loveukingstonjames"

She also shared a video of her boyfriend Blake Shelton smothering Kingston with birthday kisses on the cheek. Kingston pulls away and in true teenage fashion wipes away Shelton's kisses.

Stefani is mom to three boys with ex-husband Gavin Rossdale: Kingston, 11-year-old Zuma and 6-year-old Apollo.