The singer met Kelly Rowland, Michelle Williams and sister Solange Knowles for lunch at Phillipe Chow's restaurant in West Hollywood, sparking rumours that the band would reunite.
The band split up in 2006.
Beyonce is set to headline Glastonbury later on this year.

Beyonce Knowles wants women to feel "empowered" by her perfumes.
Discussing the inspiration behind her latest fragrance Heat Rush - Bey revealed she wanted fans of the perfume to feel strong and sexy while wearing the scent.
"I created Heat Rush to bring the feeling of warmth and sensuality to every woman who wears it. It's feminine and sexy, fresh and beautiful," the Halo singer explains.
"I wanted this to be something that made you feel like you could conquer anything, and take over the world.
"Strength was something important, because a lot of my songs I write for my women, to empower them," Beyonce added. "When I spray it I feel feminine, I feel like a woman. I can leave a lasting impression."

U2 and Beyonce are rumoured to be headlining Glastonbury Festival this year.
Last week it was reported that Coldplay will be topping the bill on the Saturday night (although it's yet to be confirmed).
And now the Irish rock band and US R&B star have also been named as rumoured headliners at the three-day event, by Holy Moly.
U2 were due to perform at the festival last summer, but had to pull out when frontman Bono injured his back. Bey's husband Jay-Z previously headlined in 2007.
Glastonbury Festival runs June 22-24 and tickets are sold out.

Beyonce reveals she's excited to be headlining Glastonbury Festival this year.
Earlier this week it was rumoured Bey would be performing at the summer event alongside U2 and Coldplay.
Although organisers have yet to confirm Knowles' appearance, the R&B star has revealed the news herself.
"This really is the biggest festival in the world and I cannot wait to perform there," Beyonce told Billboard.
"Everyone who attends is really appreciative of music and is in such a good mood that entire weekend. I'm pumped just thinking about that huge audience and soaking up their energy."
In 2008, the singer's husband Jay-Z headlined the festival. The event is sold out.

Jessie J hopes to be as successful as big US stars like Beyonce and Katy Perry.
The Do It Like A Dude singer was awarded the Critics Choice prize at last night's BRITs and speaking at the ceremony, revealed she wants more UK acts to become recognised.
"I am proud to say that I am British," Jessie tells Metro, "and I am proud to say that I am ready to take on the likes of Pink and Beyonce and Katy Perry and really make a name for British icons.
"I know it is a big thing to say but I am ready for it. Whether it happens or not I believe I can push boundaries. As long as I am happy and I am doing me then I can't make any mistakes really."
The Price Tag hitmaker also revealed she would "love" to work with Beyonce if "she'd let her" - especially for Knowles' upcoming headline performance at Glastonbury Festival this summer.
Jessie J Tickets are on sale now for her March tour. The album Who You Are is released February 28.

Beyonce has almost wrapped-up work on her next studio album, meaning the record could be out as early as this summer.
Singer and songwriter Sia revealed she has been trying to collaborate with Knowles on the follow-up to 2008's I Am... Sasha Fierce, but Bey has nearly completed the record.
Revealing how she got involved in the project, Sia explained: "I just said to all the producers, writers, everyone 'help me make this happen'.
"And then (producer) Diplo emailed me and said, 'where are you in the world right now? Would you be interested in flying to New York? I'm writing with Beyonce,' and I was like, 'Yesss!'"
When asked if her contributions will make the record, Sia told MTV Australia: "Well there's only one song left for this album, so I probably won't get on this album but hopefully the next one. That's my dream, that's my goal."
Beyonce previously promised the album will be diverse. She also revealed that the record will feature live instruments.