Olivia Culpo and Christian McCaffrey’s daughter Colette has added “big sis” to her playbook. 

Just days after the couple announced they had welcomed their second baby, a boy named Roman, Olivia’s sister Sophia Culpo confirmed that the 14-month-old has seamlessly transitioned into her new role. 

“She’s so sweet,” Sophia told E! News of Colette in an exclusive interview at Alice + Olivia’s breast cancer awareness benefit at their flagship Beverly Hills store Oct. 17. “She loves him. She gives him little kisses and she’s just so special.”

Indeed, the 29-year-old—who is also the youngest sibling to Pete Culpo, 38, Aurora Culpo, 37 and Gus Culpo, 31—mused that she loves seeing the second generation expand. 

“It’s so special to see her get a sibling,” Sophia noted, “because we’re such a big family. So, to see her get a brother is just so fun.”

Meanwhile, Sophia is doing some family expanding of her own, having just hard-launched boyfriend JP earlier this year on social media.