Global Glamour has joined a select group of fillies to have achieved the Thousand Guineas - Flight Stakes Group One double with a hard-fought front-running win at Caulfield.

Giving the new training partnership of Gai Waterhouse and Adrian Bott their second Group One success in the space of a week, Global Glamour became only the eighth filly and third in the last 30 years to add the Thousand Guineas at Caulfield to a Flight Stakes win at Randwick.

And adding more merit to the feat is the fact she won Saturday's Thousand Guineas only a week after her Flight Stakes success.

Jockey Kerrin McEvoy crossed to the front on Global Glamour in Saturday's 1600m race and then rallied strongly in the final 200m when I Am A Star and Whispering Brook emerged on her inside to challenge.

Global Glamour ($4.40) was drawing away again on the line to beat I Am A Star ($21) by a length with a half-neck to Whispering Brook ($8.50).

"It's a tough ask and I think she's a very special filly," Bott said after Global Glamour joined Guelph (2013) and Dashing Eagle (1996) as the most recent to claim the Flight-Thousand Guineas double.

"To do what she did last week then get on a float and come down to Melbourne and back it up in her first start at a difficult track, she's a special filly.

"Full credit to the filly. She's come a long way. She's racing a lot more seasoned now and has put it all together. We saw that last week and she's improved again."

For an elated Waterhouse, it was the first Thousand Guineas success of her decorated training career.

"She has come down here and she hasn't missed a beat," Waterhouse said.

"And I said to Kerrin 'all you've got to do is just replicate what Tim Clark did last week'.

"It's so exciting."

Bott, 29, said he was loving the opportunity of training in partnership with Waterhouse.

"She's an incredible person to share the success with," he said.

McEvoy, who won the Thousand Guineas on Guelph, said he was pretty confident throughout the race.

"I knew I was in a nice rhythm and she'd have a kick when I asked her," he said.

"And the rest is history."