Say What is your guide into what has been happening in the world of celebrity on social media.

Blink and you'll miss a tweet. Scroll too fast and that all important selfie will never dazzle your eyes. Don't panic, as we have this weekly guide on what your favourite celebrities have been up to on social media. Here is what has been happening this week -

Justin Timberlake's bringing sexy back to the UK

Pop hunk Justin Timberlake is expected to wow the crowds at the SSE Hydro in Glasgow this weekend - but he arrived in the UK earlier this week. The star posted this picture on his official Instagram and said: "The UK/Euro leg of #JT2020Tour has officially kicked off!! Backstage right before we went on in Sheffield...#TheTNKids." We are pretty sure Justin Timberlake mania will sweep the nation as the tour continues its UK dates.

All about Ora

We spy a new friendship in the world of celebrity. For All Saints star Nicole Appleton posted a picture with Rita Ora this week. Nicole, who has been touring the UK with All Saints as a support act for the Backstreet Boys tour, which rolled into Glasgow last night, posted: "Beautiful girl @RitaOra." How good would collaboration be between Ora and the Saints? Or are we just getting ahead of ourselves?

Gaga goes to the theatre

Lady Gaga celebrated her 28th birthday by taking in a Broadway show starring James Franco. The singer went to see Franco's performance in Of Mice and Men with boyfriend Chicago Fire star Taylor Kinney. James Franco posted a picture of the group on his Instagram and said: "Lady Gaga came and loved it! Of Mice and Men!!! Come! #ladygaga."

Is 1D's Niall, Prince Charming?

Rochelle Humes from the Saturdays celebrated her 25th birthday in style - by encouraging her celeb pals to dress up as Disney characters. And it seems Niall from One Direction has lived up to the name he has no doubt already been given by his army of fans as he donned a Prince Charming outfit. Husband-and-wife team Rochelle and Marvin opted for Aladdin and Jasmine - how sweet! Marvin's JLS bandmaster Aston Merrygold was also at the party and he did a fantastic tribute to Alice in Wonderland's Madhatter. How awesome does this party look?

Keeping up with the Jenners

Brody Jenner posted this picture of himself hanging out with brother Brandon and dad Bruce this week. There wasn't a Kardashian in sight as the group spent some quality time together. Brody said: "Family first @sprandoni and Bruiser."

Enrique visits the Voice

Latino hunk Enrique Iglesias visited The Voice to perform in the semi-final alongside superstar Shakira. And it seems a certain judge was thrilled to see him as Kylie posted a picture to mark the moment. The pair recently worked together on the track Beautiful which features on both of their new albums. He is just so handsome, lucky Kylie!

The look of love

Mariah Carey posted this adorable picture of her and her husband gazing into each other as they walked on Instagram this week. She tweeted, "We're walking." We expect this would be a difficult task for her - as she no doubt had fabulous skyscraper heels is Mariah after all.

Baby Eyed Peas

How cute is Fergie from the Black Eyed Peas son Axl? The star, who is married to actor Josh Duhamel, posted this picture of her adorable tot in a Ferrari on Instagram. She said: "What happens when daddy goes to set...#roaddogz4life." If he is 'driving 'a supercar at this age, we can only imagine what he will be driving when he is a teenager.

Demi dresses up for the beach

We have to say how fabulous is Demi Lovato looking in this picture? The singer posted on her Instagram, "That one time I went on vacation and looked SO latin!!!!" We think she is giving JLO a run for her money, don't you?

Werewolf in Venice

We just love this picture of Teen Wolf actor Colton Haynes in Venice. The heartthrob, who also stars in Arrow, posted the picture on his Instagram. For once he looks chilled, I mean he is usually always fighting with someone in the action packed shows he stars in.