Best celebrity Twitter and Instagram posts of the week: Orange Is The New Black, Caitlyn Jenner

A new social media record has been broken courtesy of Olympic champion Caitlyn Jenner, who opened her first ever Twitter account after her iconic Vanity Fair magazine cover.

It was an uplifting start to the week with Fancy rapper Iggy Azalea announcing her engagement to NBA basketball player Nick Young by flashing her gorgeous diamond ring on Instagram.

Elsewhere in the Twitter and Insta-verse, the cast of Orange Is The New Black took Europe by storm on their promotional tour for the much-anticipated third season, while singer Justin Bieber spent some quality time with his young siblings and shared the adorable photos with his Beliebers.

IBTimes UK rounds up all the best social media action from this week in case you missed it all...

Orange Is The New Black takes Europe

Taylor Schilling, Laverne Cox, Uzo Aduba and Danielle Brooks were among the cast members who descended on Europe to create an even bigger buzz around the upcoming season three premiere heading to Netflix on 12 June.

In the midst of visiting the Eiffel Tower and the Louvre, the group made sure to take plenty of selfies to keep their devoted fans in the loop.

Emily Ratajkowski brings two special dates to Entourage premiere

The Blurred Lines model has a string of admirers trailing after her but she chose to give her parents a big night out at the premiere of the anticipated spin-off movie. Seriously cute.

Caitlyn Jenner makes her social media debut

The Keeping Up With The Kardashians star broke the internet when she revealed her female identity to the public for the first time via a glamorous Vanity Fair magazine feature before joining Twitter.

So far, Jenner has amassed more than 2.41 million followers. Not bad for just a few days.

Diana Ross joins Twitter

Caitlyn Jenner joined at 65 and now the legendary singer has proved it is never too late to sign up to social media, starting her Twitter account at 71.

Perhaps her best tweet so far is promoting her son Evan Ross's new single How To Live Alone. She's a pro already.

Drew Barrymore celebrates wedding anniversary

The Going The Distance actress and her husband Will Kopelman celebrated their third wedding anniversary with an Instagram selfie and a touching message mentioning their daughters, Olive and Frankie.

Congratulations Kopelmans, here's to many more.

Justin Bieber bonds with Jaxon

The 21-year-old singer may have run into some legal trouble but the All That Matters hitmaker enjoyed some quality family time with his young brother Jaxon to lift his spirits.

Iggy Azalea gets engaged

They are one of showbiz's most loved-up couples, so it was only a matter of time before LA Lakers basketball star Nick Young popped the question. The proposal took place at his carnival-themed 30th birthday party in front of their friends and family.

Of course, Azalea could not wait to return to Instagram to share the lovely news and photos of her flashy engagement ring. Congratulations to the happy couple.