It's obvious that is NOT Tila's baby bump. Tila should be 14-15 weeks pregnant by now, and her bump would not be above the navel. So that rules that out, but what is it then? Here's some pics that show different stories. There ARE people who can stick out their stomach and make themselves look pregnant, I have seen it done. The "rod" could be used for her pushing her stomach UP. Also I realized that in her original photo I can see what looks like the leg as as well. All of these pictures I edited myself.
This is a picture brightened and rotated.
The yellow shows a random rod right under the tummy/boob.
The bluish purple shows some thing that DOES look like a belly button, some say it's a scar.
And the pink shows what could be the end of the rod, or her piercing.
Here the pic is brightened and rotated again.
The yellow circle shows what is obviously part of her skin, it has the same tone. Some people think it is another boob, while others think it is a leg.
The green circle I'm showing what looks to be the belly button again, except there is clearling something in it, a bump which could be a nipple.
This is a pic I made gold metallic just to try it out, but i discovered something..The circle shows what look to be a leg. Though I did not see this in any other form of the picture, I see now that it does very much look like a leg, and on some other pictures it does too. There is that space so it clearly isn't a boob. In the above pic you see a black triangle that in this picture shapes out the leg.