How did a pregnant pregnant Kim Kardashian spend her Valentine's Day morning?

By leaving beau Kanye West at home and hitting the gym!

After returning from their Rio de Janeiro vacation earlier this week, the expectant star got right back into her regular routine.

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With her hair in a messy top knot, Kim looked chic in black shades, yoga pants and a tank top with a white sports bra and long sleeved white tee as she left the facility.

The star has been rather vocal about maintaining a healthy lifestyle while pregnant, openly discussing her diet and rigid workout routines with Tracy Anderson, a celebrity fitness guru whose other clients include Kate Hudson and Gwyneth Paltrow.

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"She [Tracy] is helping me make the adjustments necessary to keep me feeling happy, healthy and most importantly create a workout plan that is safe for the baby," Kim wrote on her blog after announcing her pregnancy. "It's really important for me to have a fitness routine that works for my body and my schedule and I'm really happy with the workout plan Tracy is working with me on.”

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This is the first Valentine's Day that Kanye and Kim will spend together as a couple — they began dating in April 2012. And with their little one due in July, we're pretty sure Kanye has something pretty spectacular planned for his gal tonight!