Sandra Bullock Rushes Her New Baby Girl To Emergency Room — Why The Trip Devastated Bullock

Although whatever prompted the urgent hospital trip was not serious after all, an insider told Star that the toddler Sandra was so worried about, is in fact her new daughter!

Determined to give her adopted son, Louis, 5, a sibling, Star readers know that the Academy Award winning actress had been planning to adopt a second child for quite awhile, and even started the process back in 2013.

But she wanted to keeps things hush-hush until she was ready to tell the world. Her baby girl's health scare "wasn't how she wanted folks to find out that she's become a mom again," a source divulged to Star.

While her son's adoption was finalized back in 2010, amidst her nasty divorce from ex-husband Jesse James, things have been looking up to the mother of two, who's been in a 7-month relationship with her smokin' hot photographer boyfriend, Bryan Randall.

Even though their union is solid, and moving in together has been discussed, Sandra's "made it clear that she's the boss when it comes to the kids," the source added.

And after being burned by her cheating ex, the Speed actress has some major trust issues. But despite her new beau's criminal past of drug and alcohol problems, he's completely turned his life around and is a great father figure to the kids, the source continued, "Bryan is wonderful with both children, very hands-on."

So the Golden Globe winner is ready to make it work, and is excited about her new life with him and her children. And as for Louis's reaction to his new baby sis? "He loves his little sister — he's very protective of her and clearly can't get enough of her."