Rumored to be engaged to boyfriend Nico Jackson, Pippa Middleton, the Duchess of Cambridge's little sister was spotted out in London without an engagement ring.

The world is on ring watch as rumors swirl that the Vanity Fair columnist's boyfriend proposed to her.

Seen strolling down the street wearing a white sweater with a beige vest while accessorizing with a large gray handbag, the socialite's left ring finger was bare.

The stockbroker allegedly asked Middleton to marry him over the summer and the two have been keeping things low-key ever since.

According to E! News, insiders claimed that Middleton was designing her own ring which could explain why she hasn't been seen with one.

[To see Pippa Middleton without her engagement ring click HERE]

The socialite is expected to walk down the aisle next spring with the couple reportedly ecstatic about their upcoming nuptials.

E! News reported that the wedding is rumored to most likely take place at Middleton's parents' Bucklebury home, with the ceremony held at the church nearby the estate.

Is Pippa Middleton engaged to Nico Jackson? What do you think? Leave us a comment of your thoughts below.