Fresh off her engagement, Miranda at some quality time with her 5-year-old son Flynn in Malibu on Wednesday -- and they both couldn't stop smiling!

For the mother/son outing, Miranda donned an ab-baring white t-shirt, ripped jeans and strappy sandals. She outfitted her little man in a long-sleeved white shirt and comfy pants. The cuteness of it all!

The Australian can't seem to get the grin off of her face since becoming engaged to Snapchat founder Evan Spiegel last month.

The 33-year-old posted a sweet snap of the pair on Instagram and they look very much in love.

The model showed off her flawless complexion as she got cozy with her 26-year-old squeeze. Adorbs!

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A photo posted by Miranda (@mirandakerr) on