Taylor Swift celebrates her birthday

The 'Shake It Off' hitmaker was accompanied by boyfriend Calvin Harris and her mother Andrea for a lavish bash at Apple executive Jimmy Iovine's Malibu home, which, as well as marking the pop star turning 26 also saw guests toast another birthday girl, Jimmy's daughter Jessica, as well as ring in the festive season.

A source told Us Weekly magazine:"Taylor was given a cake and they sang 'Happy Birthday.' "

And Taylor and Calvin weren't the only famous guests at the bash.

The source added: "Gwen Stefani and Blake Shelton were there and they looked really, really cute."

In a video posted on snapchat, Taylor, Calvin and DJ Snake were shown snuggling up to Santa while posing for photographs, while Jimmy's son Jamie Iovine shared a selfie of himself hanging out with the couple.

Jamie's other pictures from the bash showed guests were entertained by a giant, real-snow, ski slope, reindeers, penguins and a Santa's grotto.

As well as enjoying the party, Taylor also announced yesterday she is teaming up with Jimmy for a new venture.

The 'Bad Blood' hitmaker took to Twitter to reveal the forthcoming release of the '1989' World Tour LIVE concert film on Apple Music.

She tweeted: "Thank you so much for all the birthday wishes. I have a little surprise for you.#1989WorldTourLIVE @applemusic (sic)."

And Taylor also included a clip of the film in which she explained her dreams for the tour. 

She said: "Getting ready for this, I wondered about a lot of things. I wondered what it would be like to perform for 70,000 people. I wondered what it would look like if they were all lit up and just dancing around like no one was watching them."

Referring to her many celebrity guests on the tour, she said: "I wondered what would happen if I invited the most amazing artists in the world to come out with me and perform with me on my stage. Would they do it?" 

The film has been directed by Jonas Akerlund and will be released on December 20.