Tamera Mowry-Housley and her niece Alaina. Picture: Instagram

TV personality and actress Tamera Mowry-Housley and her journalist husband Adam Housley are mourning their niece who was fatally wounded during a mass shooting in California on Wednesday.

Tamera took to Instagram on Thursday evening to pay tribute to her 18-year-old niece, Alaina Housley, who was killed alongside 12 others in a shooting at Borderline Bar and Grill in Thousand Oaks.

In an emotional post, Tamera penned a letter to her niece. She wrote: "Alaina. My sweet, sweet Alaina. My heart breaks. I’m still in disbelief. It’s not fair how you were taken and how soon you were taken from us," Tamera wrote alongside a slideshow of photos of her niece. "I was blessed to know you ever since you were 5. You stole my heart. I will miss our inside jokes, us serenading at the piano. Thank you for being patient with me learning how to braid your hair, and I will never forget our duet singing the national anthem at Napa’s soccer game."

"I love you. I love you. I love you. You are gonna make one gorgeous angel. My heart and prayers are with every victim of this tragedy," she added. 

Before learning of Alaina death, Tamera and Adam both used their social media pages to seek information about their niece. Tamera's twin sister, Tia Mowry, also shared a photo Alaina, alongside the caption: "Alaina Housely we are praying. We love u!"

According to CNN, Alaina was a student at Pepperdine University in Malibu.