Melissa, 48, was all smiles as she made her way into the venue wearing a retro army green military jacket with black pants and black Chelsea boots.
Charlie, 53, kept his outfit casual and wore a navy blue bomber jacket with a blue shirt and black joggers.
Mad Men's January Jones was spotted outside of the concert looking fashionable in a grey striped blouse, blue jeans and black heels.
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Actress Milla Jovovich treated her 11-year-old daughter Ever to the show. Milla, 43, wore a white tank top with light blue jeans and zebra printed heels. Her daughter rocked a pair of black shorts, a matching shirt and a pink jacket.
Billie, 17, who rose to fame from her song "Ocean Eyes," in 2016, has been touring North America since May 29. Her last concert is on Saturday, July 13 in San Diego. She heads back on the road on August 20.
Ahead of her concert in LA, the performer dropped a remix of her hit song "Bad Guy" with her childhood crush Justin Bieber.
Whose outfit from the concert do you like best? Let us know in the comments below!