In August 2013, Vega became engaged to former "Big Time Rush" actor and singer Carlos Pena Jr., who she had been dating since late 2012 The couple married on January 4, 2014 in Puerto Vallarta, Mexico, both taking PenaVega as their married name. The couple shares a YouTube channel, LexLovesLos. They have two sons. Ocean King PenaVega born in December 2016 and Kingston James PenaVega born in June 2019. In December 2020, they announced that they are expecting their third child, a girl.