Gwyneth Paltrow and Chris Martin party together in Los Angeles

and

proved yet again that they are

following their split when they partied together at a book launch in LA this week.

The former couple, who have remained close friends since

, mingled and posed for photographs with fellow guests

although notably not together.Given the relaxed, garden party-style of Vicky Vlachonis'

launch, Gwyneth opted for black shorts, sandals and a chic white sleeveless blazer while Chris wore a blue T-shirt and trousers.

Gwyneth Paltrow with Vicky Vlachonis and Cameron Diaz

Gwyneth let her hair down at the event and was seen laughing and joking with her celebrity friends including Cameron Diaz, designer Jennifer Meyer, Tobey Maguire and

actress Dakota Johnson.Also present at Vicky's book launch were

and her brother-in-law Benji Madden.Nicole, who has been married to Benji's brother Joel Madden since 2010, sported a colourful patterned maxi dress that matched her vibrant purple hair.

Chris Martin with Vicky Vlachonis and Jennifer Meyer

Chris and Gwyneth's appearance at the party comes amid reports that the pair still live together.According to

on Thursday in Los Angeles Superior Court concerning an alleged stalker, the 41-year-old claimed that she and Chris shared the same house.The pair were pictured at the house on Sunday and they celebrated Mother's Day with their two children Apple, nine, and Moses, seven.

Jennifer Meyer, Nicole Richie, Vicky Vlachonis and Cameron Diaz

The party also coincided with Coldplay frontman Chris' denial that he is dating model and TV presenter Alexa Chung.

Rumours that the pair were an item began circulating after they were seen enjoying a drink together in New York although this week a representative for the musician told the

newspaper: "They are definitely not dating".