The latest celebrity on bump watch is 21 year-old Canadian singer, Avril Lavigne. Lavigne has been engaged to Sum 41 frontman Deryck Whibley, 25, since June 2005. The two have owned a home together in Beverly Hills for nearly two years. Lavigne has a small heart-shaped pink tattoo on her right wrist inscribed with the letter “D”.

Life and Style speculates that Lavigne is pregnant:

At the Paris Fashion Week Swarovski Party on 2/27 Avril placed her hand over her stomach while on the red carpet. (Shown above)

In the latest pictures we have of Lavigne at the Nylon Guys Issue launch party on 3/14 she is wearing two layered shirts and it’s hard to see her tummy. Her fiancee is also hiding his left hand. Lavigne is certainly in a stable relationship, and although she’s young she seems responsible enough to have a child. Only time will tell if she’s actually pregnant.

Samaire Armstrong is set to return to the O.C. this season as Anna. Her character will provide a much-needed challenge for bickering on-screen and real life couple, Summer and Seth.

In a recent interview with gaming site IGN, Armstrong revealed that she thinks she’s tougher than Bilson:

Now that’s a fight we would pay money to see.

The Nylon Magazine Guys Spring 2006 launch party was held last night at the Roosevelt Hotel. Guests included cover boy Adam Brody, his girlfriend Rachel Bilson, and singer Avril Lavigne.

Three more after the jump.

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