As the world continues to mourn for the victims of the mass shooting at an LGBT nightclub in Orlando, Florida, early Sunday morning, a number of stars attended the L.A. Pride Parade in West Hollywood on Sunday, and spoke out about the tragedy.

ET caught up with reality star and LGBT advocate Lisa Vanderpump at her West Hollywood restaurant, Pump, where she said she felt "great sadness" about the "random act of violence" that took the lives of 50 people and left at least 53 others injured.

"I think the most important thing is courage in the face of adversity," the 55-year-old Real Housewives of Beverly Hills star shared. "Now is the time we stand together and unite."

WATCH: LGBT Groups, Celebs and Public Figures Pay Tribute After Orlando Nightclub Shooting

Vanderpump recounted being "really devastated," when she first heard about the killings, adding, "My heart goes out to the victims and their families."

"It's definitely thrown a kind of very somber shadow over today's events, which should be a day of celebration," Vanderpump said.

"I've had gay restaurants, bars, clubs, and I've known the gay community to be a kind, peaceful community that embrace one another… such a heinous act is devastating," she added.

Sara and Erin Foster, sisters and stars of the VH1 comedy Barely Famous, also spoke with ET while riding in the parade.

WATCH: Lin-Manuel Miranda, Zachary Levi and Other Tony Stars Weigh in on Orlando Shooting

"The best way to respect what happened last night, I think, is to continue to show the strength around the pride that everyone has," Erin shared. "You can be afraid… or you can stand stronger and band together with everyone and say, 'No matter what happens we're still going to stay strong,' and still show up and still support everyone's ability and right to love each other freely and not have to be in fear."

Sara echoed Erin's message, and added that the mass shooting is "just one more reminder that gun control is not where it needs to be."

"We need to be taking steps to complete eliminate access to military weapons," Sara added. " It's just not okay."

WATCH: Tony Awards Dedicating Sunday's Ceremony to Victims of Orlando Mass Shooting

The Orlando tragedy also had a strong impact among those who attended this year's Tony Awards in New York City, with many wearing a silver ribbon to commemorate the victims during Sunday’s awards show.

Host James Corden opened the show with a message of love and solidarity, while Hamilton creator and star Lin-Manuel Miranda addressed the shootings in the form of a sonnet he recited while accepting the award for Best Original Score. Watch the video below to hear his emotional words.