WWW- Execs at Trimspa should be careful about scolding their diet program spokesmodel Anna Nicole Smith if she gains a few pounds. Sources say she has an airtight excuse: She’s pregnant.

If true, the former Playmate – who battled relatives of her late husband, J. Howard Marshall 2nd, at the Supreme Court over his estate – could be in for another scrap.

Smith, 38, is said to have conceived the child with the help of a friend.

“Anna’s freaking out because she got pregnant by this guy, who’s now saying, ‘I want money and access to the kid,'” an insider tells our Gatecrashing colleague, Ben Widdicombe.

Smith’s Supreme Court attorney, Kent Richland, declined to comment yesterday, referring our call to her manager-lawyer, Howard K. Stern, who couldn’t be reached.

Richland said his client was present at Monday’s Supreme Court hearing, where justices ruled the former stripper could press her claim for part of Marshall’s $1.6 billion estate. But while Smith readily posed for photographers at a February hearing, she appears to have dodged lensmen Monday.

Smith has a 20-year-old son, Daniel, with Billy Smith, whom she married in 1985 and divorced in 1987.

The voluptuary hasn’t been linked with anyone lately. Her former alleged paramours have included bodybuilder Clay Spires, actor Scott Baio and real estate mogul Jonathan McManus, as well as fellow Texan Sandi Powledge.