Britain's Catherine, Duchess of Cambridge, joined Prince William at a ceremony in London on Tuesday, October 21. She has struggled with &lt;a href='http://www.cnn.com/2014/09/16/health/hyperemesis-gravidarum/'&gt;severe morning sickness&lt;/a&gt;, and it was her first public appearance since &lt;a href='http://www.cnn.com/2014/09/08/world/europe/uk-royal-pregnancy/index.html?hpt=hp_t1' target='_blank'&gt;Buckingham Palace announced&lt;/a&gt; that the pair are awaiting baby No. 2 in April. These celebrities are also expecting new arrivals.