Jessica Alba thinks Taylor Swift is ''a cutie-patootie.''

The 'Some Kind of Beautiful' actress can't believe ''how sweet and lovely'' the 'Bad Blood' hitmaker is and was delighted when she was asked to make a cameo in her ''fierce'' music video for the track alongside a string of her best friends, including Selena Gomez, Lena Dunham, Gigi Hadid, Martha Hunt and Ellie Goulding.

Asked about the singer, the 34-year-old star said: ''She is a cutie-patootie. It's unbelievable how sweet and lovely she is.''

But Jessica, whose best friend Jaime King recently made Taylor godmother to her second son, Leo Thames, admits she ''was surprised'' at first by how fun and silly the 'Blank Space hitmaker is in real life.

She told the September issue of Allure magazine: ''You know what I like? I feel like I was really serious when I was in my early 20s, and she has the spirit of a kid. Not like a child, but she has this vibrant, fun, silly [side]. I was surprised by that.''

Jessica took her daughters, Honor, seven, and Haven, four, and two of their friends to Taylor's sold-out gig at the Staples Centre in Los Angeles on Monday (24.08.15).

The 'Sin City' star posted a photograph of them backstage with the blonde beauty on Instagram, with the caption: ''My lil #squad w the most beautiful, talented and kindest @taylorswift #momlife #taylorswiftrules (sic).''