Aguilera rocks baby bump at concert

US actress Scarlett Johansson may be hiding her baby bump in a trench coat at a recent wedding in England, but Christina Aguilera is doing quite the opposite.

The pregnant US pop star, 33, flaunted hers in a form-fitting little black dress last Saturday night at the KIIS-FM Wango Tango concert in California, US, where she sang some of her greatest hits.

Aguilera, who is expecting a baby girl with fiance Matthew Rutler, has a six-year-old son with ex-husband Jordan Bratman.