Nikki Reed and Ian Somerhalder are engaged!

Los Angeles - Ian Somerhalder and Nikki Reed are engaged.

The couple have been dating for the past six months and multiple sources have now confirmed they have decided to tie the knot after the 36-year-old actor proposed to his 26-year-old girlfriend.

A source confirmed to E! News: "They're so happy. They were crazy happy from the start. Their families love each other. It just feels really right."

Nikki and Ian moved in with each other after only three weeks of dating and their relationship was moved forward at pace.

How I spent my New Year's Day- in a #tbt way- wow. Week one of 2015. Thank you all for giving me so much strength-we're ready to kick major ass and make a great future staritng now . Happy 1st week of the New Year- I hope you're on track with making your future the most sustainable and harmonious one possible... Love, Ian

A photo posted by iansomerhalder (@iansomerhalder) on Jan 8, 2015 at 4:46pm PST

The pair were recently spotted looking at engagement rings in a jewellery store in Los Angeles.

An eyewitness told HollywoodLife.com: "They were absolutely adorable inside the jewellery store and you could tell they are very much in love. Nikki was pointing out items for Ian and vice versa.

"They looked at some engagement rings, including a 14k gold diamond slice halo ring and an 18k gold green halo diamond ring - both designed by Livin, and an 18k large chocolate diamond ring by White Cloud."

News of their engagement comes shortly after Twilight beauty Nikki finalised her divorce settlement from singer/songwriter Paul McDonald.

Nikki and Paul tied the knot in Malibu, California, in October 2011 following a whirlwind romance.

However, their relationship ended less than three years later when the brunette beauty filed for divorce in May 2014, citing irreconcilable differences.