Did Marian Rivera call Venus Raj "chaka"?

How true is the rumor that Kapuso's Primetime Queen Marian Rivera
allegedly described Miss Universe 2010 4th Runner Up Maria Venus Raj as "chaka" (ugly)?

This rumor has been going the rounds for quite some time now following Marian's reported controversy with co-star Bela Padilla, so I thought it's just one baseless rumor probably started by her detractors.

But just yesterday, Binibining Pilipinas-World 2006 Anna Maris Igpit posted a tweet about it, sharing what a friend told her. She said:
"From a friend: while Marian Rivera was having her make up done for Show Me The Manny taping where Venus Raj was a guest, she suddenly
made a comment 'ang chaka pala ni Venus'! WTF??!"

It allegedly happened during Venus Raj's taping for Show Me Da Manny's
September 5 episode but it's unclear though whether Anna's friend was the one who heard that or just heard of it from someone else.

And then, one Twitter user @KCelma, a fan of Marian, replied to Anna Maris' tweet, defending the Kapuso actress. The exact tweet was:
"@anna_maris for once can u at least give Marian a time to breath, if u dont want marian or u hate Marian so much, well keep it 2 yourself,
bec. if Marian is that bad, well let God decides what and how Marian is become. Try to respect others. Im nt sying bec. Im a fan, im sying
dis bec. U too has your own faults and u too is not perfect!!! Peace."

Anna Maris answered back, "@KCelma I don't hate her. I'm not a fan
either. I was just relaying what my friend told me. I worked with her
a lot of times, I was just surprised."

Yeah, just like Anna Maris Igpit, I'm also surprised to hear that and I'm hoping it's not true at all.

Photo courtesy of GMA 7 via PEP