Billie Lourd celebrated her 25th birthday with family and friends at a rainbow-themed bash over the weekend.

The 25-year-old actress rang in the occasion with dad Bryan Lourd, actress Emma Roberts, actor Colton Haynes and other pals at a pool party Sunday in Beverly Hills.

"Too much fun celebrating @praisethelourd's Bday :) Rainbows, water slides, & food trucks...the best :) Happy Bday boo!!!" Haynes captioned a photobooth picture on Instagram.

"Happy Birthday to the best step daughter! Health & Happiness! I [love] u @praisethelourd @emmaroberts #bwl #bcl25," Bryan's husband, Bruce Bozzi, added on his own account.

Lourd, who officially turned 25 on Monday, was feeling reflective the day before the bash.

She shared a throwback photo of herself with her late mom and grandmother, Carrie Fisher and Debbie Reynolds, at Disneyland.

"My mom and I went to Disneyland so much that I now realize she may have loved it even more than I did. Thank you so much to @disney for making my mom the ultimate Disney combo: a princess and now a legend," the star wrote.

Reynolds died of a stroke at age 84 on Dec. 28, the day after Fisher died at age 60 following a heart attack.

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Fisher, who played Princess Leia in the "Star Wars" films, appeared posthumously in a behind-the-scenes video for "Star Wars: The Last Jedi" shown at D23 on Saturday.

"It's about family and that's what's so powerful about it," the actress said of the new movie in the clip.

Lourd is known for playing Sadie Swenson, aka Chanel #3, on "Scream Queens," and will next star in "American Horror Story" Season 7.

She recently split from "Scream Queens" co-star Taylor Lautner after eight months of dating.