Even though her older sister Kate Middleton has reached the status of royalty, it seems as though Pippa Middleton doesn't mind attending regular events as she hit the Instagram party at Jamie Olivier's 15 restaurant in London.

The Duchess of Cambridge's little sister was spotted out on Monday night mingling with the likes of Laura Whitmore and ex Pussycat Dolls star Ashley Roberts, according to Entertainment Wise.

Prince George's aunt was spotted without an engagement ring and boyfriend Nico Jackson while chatting it up with the TV chef at the bash.

[For photos of Pippa Middleton attending the Instagram party at Jamie Olivier's 15 restaurant in London click HERE]

The celebrity gossip site reported that Middleton seemed to be smitten by Olivier and completely taken by his charm as she was photographed in "fits of giggles" as they chatted. The Vanity Fair columnist wore a peach top, black skirt and white blazer.

The 29 year-old who has been deemed the hardest partier out of the Middleton sisters appeared to be having a blast at the event, according to The Sun, Pippa walked into a bush outside the event as she made her way home.

The socialite celebrated her 29th birthday earlier this month with rumors swirling that her boyfriend proposed however, there was no sign of an engagement ring when Middleton left Olivier's party.

It was reported that the couple have been engaged for a couple of months but have kept it quiet because they do not want to overshadow the birth of Prince George who was born in July.

A source told Sunday People, "They didn't want an announcement before Pippa's birthday because they didn't want to take the shine off Kate and her baby."

Middleton and Jackson have only been dating for about six months but the insider revealed to the newspaper that Pippa is sure she's found the one, especially after seeing how happy older sister has been since getting married in 2011.

The source said, "Pippa loved seeing Kate go down the aisle and now it is her turn for a fairytale wedding. She couldn't be more sure that Nico is the right for her. They are such a good fit for each other and their families get on really well. Everyone is so happy for Pippa."