^ LOL! I know what you mean. And imagine if that SG girl has hosted a kid's show (there's one!)---- SG accent trying to sound British/American + trying to act cute, yikes!
So here's my observation on them--
I see Andrea as this serious person when it comes to her career. She has built it on her own. Any form of horsing around can be seen as obnoxious to a person like that. They do have their fun times but they separate play with work.
Christabel, on the other hand, is this person who tries to act cute all the time. I mean, the woman is 23 and has finished undergrad in AU. Don't girls usually mature and leave their bubblegum cuteness after that? Apparently, not all.
While I didn't really base my judgment on the this picture (I based in on some videos, if I find it in my cache, I'll try to upload it), I guess we could still depict the body language in them.
Christabel flailing all of her limbs outside while Andrea tries to find her way out, and was left to raise it behind them. Actually, you'd see a lot of pictures of Christabel flailing, covering other people in the pics. I see this as Christabel's act cute overstepping her bounds and in some way invading Andrea's personal space.
As for the videos mentioned, it's Christabel, Andrea and others walking. Christabel being her vain self, acting cute (tongue may or may not be sticked out) and showing Andrea just walking away and texting. They're not even side by side, and not BFF-like, as they have always been portrayed.