Justin Timberlake and Jessica Biel "have lots of people they want to invite" to their wedding.

The couple are currently planning a sumptuous summer commitment ceremony.

Jessica and Justin have an abundance of loved ones they will ask to witness their nuptials.

"It will be a big wedding," a source told Us Weekly magazine. "They have lots of people they want to invite."

Jessica is not too overwhelmed with the event planning, as her future mother-in-law Lynn Harless has selflessly assisted throughout.

"She's helping Jessica with every little thing," the source continued.

Jessica is hands-on about choosing the perfect wedding dress and is now narrowing down her favourite designs.

"Monique Lhuillier has sent over some sketches," a source said. "She's Jessica's first choice."

Justin and Jessica have been together on-and-off for around five years.

Justin is understood to have popped the question over the Christmas break while the pair were holidaying together.

They have so far kept details of their relationship private, with Jessica only showing off her engagement ring for the first time in February.