Image imported from derpibooru 
Original Description:
 
“I just can’t believe how big I’m becoming… And so quickly, too…”  
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Rarity sighed as she tugged down on her tank top, far too small to cover up much of her bulging body. “I can hardly fit into any of these old outfits anymore,” she muttered to herself as she tried to adjust the waistband of her track shorts, feeling it dig into her flesh.  
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“Well, perhaps this old Friendship Games uniform can still be of use?” She wondered to herself as she stepped into view of her full-bodied mirror. While she was expecting to find a fairly large girl looking back at her, she certainly wasn’t expecting the girl to be that large.  
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With her top fitting more like a sports bra for her sizable breasts, Rarity’s hugely massive belly simply hung out freely over her lap. It wobbled and shook with each step, hiding what little could be seen of her shorts as they stretched and hugged around her thickening thighs.  
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“Goodness… I’m huge.” A smile on Rarity’s face began to form as she continued to gaze at her immense figure. While her new-found girth was always hard to ignore, something felt different this time.  
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Playfully grabbing and caressing her rolls and folds, watching her belly bounce and ripple with every touch, feeling the juxtaposing soft heaviness of her flesh, even finding little to no imperfections of her smooth skin…  
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It genuinely felt like the first time she’s really admiring the way her body felt. Feeling a whole new sense of appreciation stirring within, she knew exactly what she needed to do…  
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“I need to take a selfie!”  
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Rarity - 510 lbs  
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Please note, this is a revised version of this pic.