Alexa Vega shows off engagement ring in Instagram photo

If you didn't know to look for it, Alexa Vega's new stunner of an engagement ring might go unnoticed in the Instagram photo posted by her fiancé, Carlos Pena.

The "Spy Kids" actress and Big Time Rush singer appear to have gotten engaged during a romantic road trip over the weekend. The enamored singer shared the photo of his lady love leaning in through the open window of the car, iPhone and Starbucks beverage in hand -- not to mention the lovely sparkler on her ring finger.

Vega, 25, was previously married to producer Sean Covel from 2010 to 2012. While their divorce was finalized less than a year ago (Vega and Pena have been dating since late last year), Covel is taking the news in stride, tweeting his best wishes to the happy couple.

Deepest congratulations to @alexavega and @TheCarlosPena! May your days be happy, lives be long, and your children, somehow, be tall. ,-)

— ! Sean Covel ! (@seancovel) September 12, 2013