Schwarzenegger, 17, tweeted, "Back to school shopping. I'm [too] tired so @mariashriver is pushing me around."
The budding model recently told "Extra" he is interested in acting and hinted that a "future project" with his dad could happen.
In the meantime, the teen is also focused on Project 360, a charity clothing line he started when he was 15. "The birth [of 360] was two years ago at a women's conference. Me and my friend Nick started selling bracelets for a battered women's shelter."