Julia Roberts shares a great family snap, David Beckham dons fancy dress and Liv Tyler shows off her engagement ring.

From Beyonce and Michelle Obama's reunion to Blake Lively's Preserve message: this week's A-list Instagram highlights

Beyonce supports Michelle Obama's campaign

North West and Ellen Degeneres get acquainted

Kim Kardashian and Ellen up their selfie game

Blake Lively handles the Preserve US drama brilliantly

Lena Dunham picks the most appropriate sweatshirt ever

... though she doesn't make it home with it

Kate Bosworth nails the street style pose

Naomi Watts celebrates her birthday with family

Rosie Huntington-Whiteley launches the #ShowYourStrap campaign

Kaley Cuoco locks in some quality time

Mindy Kaling goes DIY in the bathroom

Lady Gaga and John Travolta establish a routine

Kate Hudson does her bit for charity

Tom Daley announces his engagament

Romeo Beckham turns model for brother Brooklyn

Cindy Crawford and Coco Rocha bond at book signing

... while Reese Witherspoon gets reading

Caroline Flack makes a new friend

Erin O'Connor gives us hotel room envy

The new supers get together in Paris

Alexa Chung nails double denim

Miley Cyrus forgets the eye make-up remover

Julia Roberts shares a family throwback

Beyonce and Blue hit home soil after their holiday

David Beckham does his best Freddie Mercury

Gwyneth Paltrow catches Chris Martin in concert

Blake Lively gets surreal with her selfies

Victoria Beckham wins another fashion award

Elisabetta Canalis welcomes her baby daughter

Kim Kardashian lets North West's curls loose

Caroline Flack tries the purple rinse

Karlie Kloss makes it to Milan

Somebody catches Suki Waterhouse and Cara Delevingne off guard

Liv Tyler shows off her new engagement ring

Then celebrates with David Beckham and Noel Gallagher

Lena Dunham and Hilary Clinton take a selfie

...before she makes her debut on The Simpsons

Michelle Obama congratulates Beyonce at the Global Citizens gig

Before she gets back to her family holiday

Blue Ivy and Beyonce don matching sun hats

Then take a walk on the beach

Taylor Swift performs with Mick Jagger

... and Leona Lewis...

And Steven Tyler

The pair set off fireworks

Victoria Beckham attends the Social Good Summit

And meets Queen Rania of Jordan

David Beckham and Malala catch up

Katy Perry plays the pan flute atop Wayna Picchu

Before putting on a show at the Rock In Rio festival

Naomi Campbell and Dakota Johnson jet home from Milan

Kim Kardashian and Riccardo Tisci team up for a photoshoot

Cara Delevingne hits Rio with Rihanna

And makes the most of the sunshine

... and parties with Sam Smith

Cara Delevingne showers praise on Rihanna

Serena Williams takes a dip

Then celebrates turning 34

Amy Schumer enjoys sun, sea and sand

Reese Witherspoon's son turns three

... And his cake looks pretty epic

Karlie Kloss gets the weekend workouts in

Kate Bosworth and Jaime King enjoy a night out

Kim Kardashian finally gets to work with her make-up icon

Amy Schumer nails the acceptance speech

From Beyonce and Michelle Obama's reunion to Blake Lively's Preserve message

This week's A-list Instagram highlights