Big time news for a hot young couple! Big Time Rush singer Carlos Pena is officially engaged to girlfriend Alexa Vega. It appears that it was a road trip that lead to this walk down the aisle. Carlos shared a picture on his Instagram account, showing Alexa leaning against the car window sporting a huge ring. And the Machete Kills actress also conirmed the news, sharing a picture of Carlos with the caption "Hello Fiance.." The adorable couple have been together since late last year, and have been inseparable ever since. This will be the second marriage for Alexa, the 25-year-old was previously married to movie producer, Sean Covel.