The 'Price Tag' singer was in sunny Rio de Janeiro over the weekend for the Rock In Rio Musical Festival, which saw her take to the stage in front of thousands.
Jessie performed wearing a multi-coloured, cut-out jumpsuit, but it was her slick, longer hair style that really caught our attention.
She shaved her signature shoulder-length black hair off for Comic Relief back in March, and has been colouring her shorter locks blonde as they grow back.
In August, she told the Daily Express she was frustrated by people asking what she wanted to do with her hair now, saying: "The truth is I don't know. It's not like I have a book under my bed that's a plan for my hair!"
Before taking to the stage in Rio, the singer took some time out to relax on a gorgeous sandy beach. Us, jealous? Jessie added the caption: "Cutting some serious shapes on the beach... What am I doing?! #riolife."
It was announced last week that Jessie will be supporting Robin Thicke on his upcoming US tour, which kicks off 21 February 2013 in Atlanta, Georgia.
Jessie and Robin have worked together in the past, recording the track 'Calling All Hearts' together, and it's clear Jessie is pretty excited, tweeting: "Thank you @robinthicke for asking me to support you on your US tour! I am so ready! Lets do this!"
She added the hastgag: "#USheartbeatsitsfinallytimeformetocomemeetyouall."
It was also announced recently that Jessie's coaching role on The Voice UK will be taken over by Kylie Minogue.
Jessie confirmed earlier this year that she won't be returning to the BBC One talent show for a third season, leaving her red chair free for Aussie pop star Kylie.
Watch Jessie's music video for 'It's My Party' below: