Kourtney Kardashian & Baby Reign Get 'Serious' in Rare Instagram Photo

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Kourtney Kardashian may be going through a rough breakup, but that hasn't stopped the hot mama from being playful with her little ones.

On Friday, she shared a photo of her 8-month-year old son, Reign, in her arms while the two relaxed outside -- though their faces were anything but chill. "Serious," she captioned the Instagram.

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A previous post featured the 36-year-old mom of three grinning and holding Reign. "Smiling," she wrote.

It looks like the two are having fun together!

Kourtney rarely shares pic of her youngest, even though he is so cute! How adorable is his light brown hair and chubby baby arms?

This isn't the first time we've seen Reign, however. In April, the proud mama shared a sweet pic of her then 4-month-old "little turtle dove angel."

Kourtney recently broke up with long-time boyfriend Scott Disick, with whom she shares three children -- Reign, Mason, 5, and Penelope, 4.

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Since the split, the Keeping Up With the Kardashians star hasn't shied away from social media, even if her baby son isn't always the one in her photos. She's been sharing pics of her sexy bikini bod from her family vacation in St. Barts and of her toned abs while getting ready to go to the gym.

She's also spending a lot of time with her sisters, who've made appearances on her Instagram. She took a selfie with Kim Kardashian, Khloe Kardashian, Kylie Jenner and Kendall Jenner on Thursday, captioning the goofy pic, "Seasterz."

Nothing like a little sister power to help you move on from your ex!