At first glance, Alexa Vega's Sept. 11 Instagram looked like a shameless shirtless shot of her cute boyfriend. But look closer — the caption reads "Hello, fiancé."

So we're calling it: This 25-year-old actress is engaged and preparing for her second marriage!

Need further proof? Her now-fiancé posted a photo from their road trip that shows the bride-to-be casually showing off a diamond on her left ring finger.

The lucky guy in question? That would be Carlos Pena Jr., a 24-year-old actor and singer best known for being in the band Big Time Rush and its associated Disney Channel show.

Alexa, meanwhile, has gotten steady work since her breakout role in the Spy Kids series, having also starred in Sleepover and From Prada to Nada, among other films. Plus, she's about to hit the big screen again in Machete Kills.

From 2010 to 2012, Alexa was married to Napoleon Dynamite producer Sean Covel.

Lately, she's been proving that she's all grown up on Instagram, posting snapshots in which she wields massive firearms and massive cleavage!

We're wishing her all the best in her second chance at wedded bliss. Congrats, you two!

Source: Alexa Vega on Instagram, Carlos Pena Jr. on Instagram

Dan Clarendon is an assistant editor at Wetpaint Entertainment. Follow him on Twitter and Google+!