At one point, Jesy, who sported a new cropped hairstyle, went to have a heated conversation with Jade and was seen gesturing with her hands.
Jesy then chose to sit away from her group mates on a concrete kiosk where she looked thoughtful and distracted herself with her phone.
Recently engaged Leigh Anne Pinnock also kept her eyes on her mobile as she walked to the house she shares with handsome footballer Andre Gray.
A spectator said fellow Little Mix star Perrie Edwards left rehearsals 15 minutes earlier.
The band have just returned to work promoting their new single Holiday – their first in four months after Break Up Song was released during the lockdown in March.
During an appearance on Capital’s Evening yesterday, the group opened up about the extra lengths they had to devote to filming the Holiday video.
The group had to undergo regular temperature tests and film their parts separately before the clips were overlaid to make it look like the four X Factor winners were still together.
Speaking to radio host Jimmy Hill, Perrie said, “I mean it was a very weird experience. It was like everyone had to fill out forms, everyone had to wear masks and visors that were on set, there were only a certain number of people on set.
“We had to have our temperature taken. We had to stay away from each other, and they’re going to kind of super-impose.
“So we were together, but we were distant, so it’s so smart how they did it, and we saw a montage yesterday and we gagged. It’s crazy. “
Jesy’s personal life has been busy for a few weeks as she recently teamed up with Our Girl star Sean Sagar.
The couple were seen having drinks at a trendy East London bar together over the weekend – after previously denying they were an article
Jesy was seen laughing at Sean’s jokes as he put a loving arm around his waist.
In early July, Sean was spotted leaving Jesy’s house in photos obtained by The Sun.
Sean is best known for playing Private Jaiden Montgomery in the BBC One hit Our Girl alongside Michelle Keegan.
The romance is believed to be Jesy’s first since she split from Chris Hughes in March.