Also, she definatley did not get lip fillers. There is no way anyone would do this to a heavily pregnant woman.
When you're pregnant you hold onto alot of excess water (water retention), and one of the first places for it to be noticable is the lips. The amount fluctuates all the time, especially bigger in the morning.
When I was pregnant so many people would comment on my lips saying how much fuller they were and that it looked like I had filler.
She will 1000% be making her botox/filler appointment as soon as that baby is out though. Maybe thats the "specialist appointment" she booked in advance