New York, Dec 4 : Pop princess Britney Spears’ comeback receives comments from her ex hubby Kevin Federline and her ex-assistant Alli Sims.

Sims, who had been fired in January after the singer''s mental breakdown, is not in favour of Spears’ upcoming world tour as she revealed to In Touch magazine, and has laid the blame on the singer’s parents.

“How can they say Britney is sick and then shove her out on the road, with all that pressure?” the New York Daily News quoted her as telling the mag.

“They claim she is unable to care for herself, but then they’re pushing her to go back to work.

“This isn''t part of her therapy. It''s a world tour. ... It means she won''t be able to see her children. And that will be heartbreaking for Britney,” she added.

Federline on the other hand was all for the tour and even told People magazine that he''s “definitely rooting” for his ex-wife.

Kevin Federline also got in on the action - with a more positive spin, telling People magazine that he''s "definitely rooting" for his ex-wife.

Spears, who is still under her father''s conservatorship, announced her plans for a world tour on December 2, that will kick off in March. (ANI)