Prince Harry and Meghan Markle
Baublebar's Peacemaker ring keeps on selling out after Meghan Markle posts a photo of her wearing it. Pictured: Prince Harry and Markle visit Reprezent 107.3FM on Jan. 9, 2018 in London. Getty Images/Chris Jackson

Meghan Markle's Meghan Effect continues to grow.

Whatever the "Suits" star wears, it instantly becomes in-demand. In November, Prince Harry's fiancée posted a photo of herself with a cheap multi-finger gold leaf ring from BaubleBar on Instagram. After sharing it online, the Peacemaker ring instantly sold out.

Fans have been waiting for months for BaubleBar to restock the $42 ring, which is a far cry from Markle's royal engagement ring. The brand released new items this week and it's been selling out quickly. In fact, if you visit the site, one has to pre-order it, which means that the ring is out of stock again.

"A Meghan Markle favorite, this bestseller has been brought back! Inspired by nature, a multi-finger ring features crystal covered vines that delicately wrap around the hand. Ring is adjustable. Size 6/7 best fits 5-8 and size 7/8 best fits 6-9," the listing read.

Markle got her Peacemaker ring from her friend Olivia Palermo. After receiving the present, the "Horrible Bosses" shared a snap of it on her Instagram account.

"My sweet Olivia Palermo - thank you for all the baubles," she wrote in the caption (via Daily Mail). "Loving your collab with Bauble Bar, beauty! #newfavoritering #baublebar @_thetig."

Markle's Meghan Effect has been in full swing since she started dating Prince Harry. In fact, the actress' brands of choice admitted that they have struggled to meet the demands.

"The interest in the brand has been incredible," Strathberry spokesperson Leeanne Hundleby told People after Markle was spotted using their bag on her first royal engagement. "The phones began ringing constantly and our visitor numbers on our website were up by around 5000 percent!"

"We are now dealing with the aftermath because everyone is trying to get it, but I don't want 10,000 white coats out there – it has to stay exclusive," said John Muscat, president and co-founder of LINE The Label, whose white wrap-style coat Markle wore on her official engagement photo call.

Markle's Meghan Effect has even surpassed Kate Middleton's Kate Effect. Both women were part of Lyst's fashion influencers in 2017. Markle is on the fourth spot while the Duchess of Cambridge trails behind at the fifth spot.

David Haigh, CEO of business valuation and strategy consultancy Brand Finance believes that Markle's influence will continue to grow this year. In fact, he expects Meghan effect to "eclipse" Kate effect.

"Diana had it, Kate certainly does, and we're already seeing how Prince George and Princess Charlotte do too. But with the wedding of Prince Harry and Meghan this May, I believe her influence will eclipse even Kate's this year," Haigh explained.