My gosh..these guys are of no help!! haha.
If you want to celebrate your gf's bday in a traditional way, bring
her to a place with nice ambience...eg, Bakerzin at One Fullerton,
or if you have deep pockets, bring her to eat at Fullerton
Hotel.
After that, give her a huge bouquet of roses and a gift that she's
been wantg for a long time.
Or you can always surprise her & whisk her away to a concert
she's been wantg to go to or something.