Patrick Schwarzenegger’s just doing what every guy does on Spring break, but in these new photos he happens to be doing it with his ex-girlfriend … which will be harder to explain to Miley Cyrus.
The pics just surfaced from the same day he was doing body shots off his BFF’s girlfriend … and relatively speaking, they’re pretty innocent.
PS and the green bikini hottie — named Taylor Burns — are chatting, laughing, and she was even considerate enough to rub suntan lotion on his back. The sun IS hot down Mexico way.

Here’s the thing … guys and girls socialize on Spring break — sometimes up close and drunkenly. Patrick’s just having a regular college experience. His challenge is Miley didn’t have that experience.
Still, we gotta say the ex-factor does complicate things. Good luck, Patrick.
TMZ