The engagement hasn't come as a surprise to those close to Ian, 36, and his Twilight star fiancée, 26. One insider told E! News that the actor had told Nikki that he had "been in love with (her) for years" – long before they decided to take their friendship to the next level.
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Ian Somerhalder and Nikki Reed are engaged after a six-month romance
"They're so happy," the source added. "They were crazy happy from the start. Their families love each other. It just feels right."
Ian and Nikki first sparked romance reports when they were spotted together at a farmers market in July. Three weeks later, they moved in together and have since adopted horses Eagle and Millie, as well as a kitten called Sohalia. They are also parents to dogs Nietzsche and Enzo.
"They were crazy happy from the start", a source said of the couple
The couple's wedding plans come nearly a year after Nikki announced her split from her husband, American Idol musician Paul McDonald, in March 2014. Ian, meanwhile, dated his Vampire Diaries co-star Nina Dobrev for three years until they ended their romance in May 2013.