Selena Gomez teaches little sister Gracie to be 'fearless' in heartwarming video

The actress' mother Mandy Teefey welcomed Gracie in 2013 with Selena's stepfather Brian Teefey

Selena Gomez is the best big sister! The singer took to her Instagram on Monday to post an inspiring video of herself sharing a heartfelt moment with her half-sister Gracie Teefey. In the black and white video, the toddler, four, told her sister, "I'm not scared." The 25-year-old responded with words of encouragement saying, "I know because you're fearless, right? You're not scared of anything, right?" The sweet sister duo then shared a high five.

Alongside the empowering video, Selena penned: "I will forever let my sister know she is strong, bold and beautiful. She will be raised to know her voice matters. She is going to understand the importance behind being a leader and inspire others by her truth." The actress' mother Mandy Teefey welcomed Gracie in 2013 with Selena's stepfather Brian Teefey.

A few months after Gracie was born, Selena opened up to E! News about becoming a big sister. "Gracie is five months old, she's adorable," she said. "I'm obsessed with her and becoming a big sister...I know I've had the responsibility to be a role model for girls but, when you have a little sister of your own, you kinda think, 'OK, this is legit.'"