The jet-setting DJ was photographed leaving Barron Hilton's memorial at Good Shepard Church in Beverly Hills on Saturday.
Paris wore an all black outfit including a blazer and skirt with matching oversized shades.
She was seen clutching onto a booklet from the funeral with Barron's face on it.
While Paris appeared to attend the funeral solo, Nicky was photographed leaning on her husband following the ceremony honoring her grandpa.
Sporting a black dress, the mom of two held onto James Rothschild as the pair walked away from the church.
Paris and Nicky's parents, Rick and Kathy, were photographed after the funeral as well.
Rick, whose father was Barron, looked at peace following the church service.
Paris shared several videos from inside the service, showcasing the late billionaire's life.
As The Blast reported, the Hilton hotel heiress announced the death of her grandpa last month.
Paying tribute to Barron, Paris wrote, "I am deeply saddened by the loss of my grandfather Barron Hilton."
She added, "he was a Legend, a visionary, brilliant, handsome, kind and lived a life full of accomplishment and adventure."
In her tearful tribute, Paris said Barron was "an incredible mentor," who she "looked up to as a businessman."
"I always wanted to make him proud," she wrote.
Barron lived a full life surrounded by loved ones.
He died of natural causes on September 19 at the age of 91.