FORBES has released its annual lists of young game changes, movers and makers.
Former Gossip Girl star Blake Lively has topped the Hollywood and Entertainment list.
Most recently, Lively has scored roles in films Green Lantern and Savages, as well as launching her own lifestyle brand, Preserve.
She's also reported to have given birth to her first child with husband Ryan Reynolds just after Christmas.
Zac Efron came in at number five while Emma Watson, Ellen Page and Emma Stone also made the list but not the top 10.
Forbes lists 30 influential youngsters in areas such as arts, music, sports, science, media and advertising.
Florida Georgia Line's Tyler Hubbard and Brian Kelley were named music's most influential under 30s.
Australia's Iggy Azalea ranked number five, with her arch rival Azealia Banks right behind her at number six.
Robert Pattinson's girlfriend FKA Twigs also scored a mention in the top 10 and another Australian act 5 Seconds of Summer were listed as number 13.