Based on how much more backfat is visible in her recent updates, she's either pregnant or stepped up her Twinkie addiction. Both would explain larger breasts.
I think the first is it.
If you look at her Jingle Bell Rock Tease Dance clip on Twitter, pay attention to her belly, looks like a pregs bulge.
Wouldn't mind if she got some rounder boobs though, would go well with that ass.
She's also been absent from MFC sinces 11 September (she looked a tad fatter, but nothing obvious yet, so possibly 2-3 months along), with likely the X-mas video recorded around october november at 4-5 months so the bulge was starting to show. Meaning she's in her third trimester now.
She hasn't posted any selfies on her Twitter feed since September either. (Dunno if anyone is nuts enough to pay that ridiculous price for her snapchat)