Report: Blake Shelton Asked Gwen Stefani’s Boys for Help With His Proposal Read More: Blake Shelton Asked Gwen Stefani's Boys to Help Him Propose

Blake Shelton and Gwen Stefani's engagement caught fans by surprise when they announced their happy news on Tuesday (Oct. 27), but at least a few people reportedly knew what was happening ahead of time — specifically, Stefani's three sons.

According to Entertainment Tonight, 14-year-old Kingston, 12-year-old Zuma and 6-year-old Apollo — Stefani's children with her ex-husband, rocker Gavin Rossdale — were involved in Shelton's proposal plans "every step of the way." A source says the country star and the kids have become close in the five years that he's been dating their mother, and "[t]hey talked it through and Blake made sure they were part of the excitement!"